de Vries Fred J., Kester Liesbeth, Sloep Peter, van Rosmalen Peter, Pannekeet Kees, and Koper Rob. “Identification of Critical Timeconsuming Student Support Activities in E-Learning”. Research in Learning Technology 13, no. 3 (October 1, 2005). Accessed April 18, 2024. https://journal.alt.ac.uk/index.php/rlt/article/view/1031.