Rüütmann, T., & Kipper, H. (2011). EFFECTIVE TEACHING STRATEGIES FOR DIRECT AND INDIRECT INSTRUCTION IN TEACHING ENGINEERING IMPLEMENTED AT TALLINN UNIVERSITY OF TECHNOLOGY. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 36. presented at the December/2011. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=970329

Stephen Wambugu Maina, & Gowland-Mwangi, J. (2011). THE EFFECTIVENESS OF AGRO-DEALERS IN ENHANCING DISSEMINATION AND ADOPTION OF THE “PUSH PULL” TECHNOLOGY AMONG SMALLHOLDER FARMERS IN WESTERN KENYA. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 33. presented at the August/2011. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=953271

Kerndl, M., & Metka Kordigel Aberšek. (2016). THE EFFECTIVENESS OF DISTANCED E-LEARNING IN TEACHERS’ EDUCATION: A CASE STUDY IN SLOVENIA. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 72, Discontinuous. presented at the August/2016. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1221616

Gowland-Mwangi, J., John Odiaga Oloo, & Stephen Wambugu Maina. (2010). THE EFFECTIVENESS OF FARMER FIELD SCHOOLS’ EXTENSION METHODOLOGY IN CONSERVING SOIL AND WATER USING CONTOUR PLOUGHING, UNPLOUGHED STRIPS AND FARM YARD MANURE. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 26. presented at the November/2010. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=924618

Mudaly, V., & Fletcher, T. (2019). THE EFFECTIVENESS OF GEOGEBRA WHEN TEACHING LINEAR FUNCTIONS USING THE IPAD. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 77(1), Continuous. presented at the February/2019. doi:https://doi.org/10.33225/pec/19.77.55

Bardasuc, L., Rubio, J. L. M., Udrea, N. M., & Domnica, M. D. (2015). EFFECTIVENESS OF TEACHING METHODS USED IN HIGHER EDUCATION: A CASE STUDY OF EUROPEAN UNIVERSITY OF MADRID, SPAIN . Problems of Education in the 21st Century, Problems of Education in the 21st Century, 67, Discontinuous. presented at the October/2015. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1185058

Amadalo, M. M., Wasike, D. W., & Wambua, J. M. (2011). EFFECTIVENESS OF TEACHING PREPARATIONS ON MATHEMATICS ACHIEVEMENT: THE CASE OF KENYA. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 31. presented at the July/2011. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=952410

Ratamun, M. M., & Osman, K. (2018). THE EFFECTIVENESS OF VIRTUAL LAB COMPARED TO PHYSICAL LAB IN THE MASTERY OF SCIENCE PROCESS SKILLS FOR CHEMISTRY EXPERIMENT. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 76(4), Continuous. presented at the August/2018. Retrieved from http://oaji.net/articles/2017/457-1533495873.pdf

Emanovský, P., & Břehovský, J. (2010). ON EFFECTIVITY OF INDUCTIVE METHODS IN MATHEMATICAL EDUCATION AT SECONDARY SCHOOL. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 22. presented at the June/2010. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=914443

Stueck, M., Villegas, A., Schoenichen, C., Bauer, K., Tofts, P., & Sack, U. (2013). EFFECTS OF AN EVIDENCEBASED DANCE PROGRAM (TANZPRO-BIODANZA®) FOR KINDERGARTEN CHILDREN AGED FOUR TO SIX ON IMMUNEGLOBULINE A, TESTOSTERONE AND HEART RATE. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 56, Discontinuous. presented at the November/2013. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1078439

Lydia Cheruto Kipkoech, Kindiki, J. N., & Tarus, P. J. (2011). EFFECTS OF ATTITUDES OF ACADEMICALLY TALENTED STUDENTS ON PERFORMANCE: AN ABILITY OR DISABILITY?. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 29. presented at the May/2011. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=942639

Özgenel, M., Canpolat, Ö., Yağan, E., & Canlı, Ö. (2019). THE EFFECTS OF ENRICHED WORKSHOP TRAINING GIVEN TO PRE-SCHOOL STUDENTS ON CREATIVE THINKING SKILLS OF STUDENTS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 77(5), Continuous. presented at the October/2019. doi:https://doi.org/10.33225/pec/19.77.616

Biscevic, I., Pasalic, A., & Memisevic, H. (2018). THE EFFECTS OF EXECUTIVE FUNCTIONS AND THEORY OF MIND ON SEMANTIC FLUENCY IN PRESCHOOL CHILDREN. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 76(1), Continuous. presented at the February/2018. Retrieved from http://oaji.net/articles/2017/457-1519987908.pdf

Mburu, D. N. P., & Nyagah, G. (2012). EFFECTS OF GENDER ROLE PORTRAYAL IN TEXTBOOKS IN KENYAN PRIMARY SCHOOLS, ON PUPILS ACADEMIC ASPIRATIONS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 47. presented at the November/2012. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1020836

Vrioni, R. (2011). EFFECTS OF GROUP LEARNING ON THE ACADEMIC PERFORMANCE OF UNIVERSITY STUDENTS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 33. presented at the August/2011. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=953270

Aztekin, S., & Yilmaz, H. B. (2014). THE EFFECTS OF HUMAN AND MATERIAL RESOURCES ON STUDENTS’ MATH ACHIEVEMENT IN 45 COUNTRIES. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 62, Discontinuous. presented at the December/2014. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1133466

Şen, Ş., Yılmaz, A., & Geban, Ö. (2015). THE EFFECTS OF PROCESS ORIENTED GUIDED INQUIRY LEARNING ENVIRONMENT ON STUDENTS' SELF-REGULATED LEARNING SKILLS. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 66, Discontinuous. presented at the August/2015. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1167872

Ismail, N. (2008). EFFECTS OF TEACHERS AND SCHOOLS ON MATHEMATICS ACHIEVEMENT. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 6. presented at the May/2008. Retrieved from http://oaji.net/articles/2014/457-1392233590.pdf

Végh, V., Nagy, Z. B., Zsigmond, C., & Elbert, G. (2017). THE EFFECTS OF USING EDMODO IN BIOLOGY EDUCATION ON STUDENTS’ ATTITUDES TOWARDS BIOLOGY AND ICT. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 75(5), Continuous. presented at the October/2017. Retrieved from http://oaji.net/articles/2017/457-1509895649.pdf

Urbanová, K., & Čtrnáctová, H. (2009). EFFICIENCY OF POWERPOINT PRESENTATION AS A COMPONENT OF SCIENCE EDUCATION. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 17. presented at the November/2009. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=900340

Kosor, M. M., Perovic, L. M., & Golem, S. (2019). EFFICIENCY OF PUBLIC SPENDING ON HIGHER EDUCATION: A DATA ENVELOPMENT ANALYSIS FOR EU-28. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 77(3), Continuous. presented at the June/2019. doi:https://doi.org/10.33225/pec/19.77.396

Logashenko, O., Shaposhnikova, T., & Lomakina, L. (2008). THE EFFICIENCY OF THE PSYCHOLOGY-PEDAGOGICAL ACCOMPANIMENT OF THE SCIENTIFIC-PRACTICAL ACTIVITY OF STUDENTS-PSYCHOLOGISTS. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 7. presented at the June/2008. Retrieved from http://oaji.net/articles/2014/457-1392235691.pdf

Cimermanová, I. (2011). E-LEARNING IN EFL METHODOLOGY EDUCATION: EVALUATION OF LEARNING PERFORMANCE. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 35. presented at the November/2011. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=968798

Klement, M., & Dostál, J. (2012). E-LEARNING IN TERTIARY EDUCATION FROM STUDENTS`POINT OF VIEW. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 43. presented at the June/2012. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1002397

Krašna, M., & Bratina, T. (2014). E-LEARNING MATERIALS FOR SOCIAL SCIENCE STUDENTS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 61, Discontinuous. presented at the October/2014. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=1125795