Novák, Martin, Jiří Křupka, and Pavel Petr. “ANALYSIS OF VIRTUAL ENVIRONMENT BENEFIT IN E-LEARNING”. Journal on Efficiency and Responsibility in Education and Science 6, no. 2 (June 30, 2013): 105–118. Accessed November 24, 2024. https://www.eriesjournal.com/index.php/eries/article/view/79.