Kalz, Marco, Karel Kreijns, Jaap Walhout, Jonatan Castaño-Munoz, Anna Espasa, and Edmundo Tovar. “Setting-up a European Cross-Provider Data Collection on Open Online Courses”. The International Review of Research in Open and Distributed Learning 16, no. 6 (December 3, 2015). Accessed March 29, 2024. https://www.irrodl.org/index.php/irrodl/article/view/2150.