Bonk, Curtis J., and Mimi Miyoung Lee. “Motivations, Achievements, and Challenges of Self-Directed Informal Learners in Open Educational Environments and MOOCs”. Journal of Learning for Development 4, no. 1 (March 24, 2017). Accessed April 25, 2024. https://jl4d.org/index.php/ejl4d/article/view/195.