Montes-Rodríguez, Ramón, Juan Bautista Martínez-Rodríguez, and Almudena Ocaña-Fernández. “Case Study As a Research Method for Analyzing MOOCs: Presence and Characteristics of Those Case Studies in the Main Scientific Databases”. The International Review of Research in Open and Distributed Learning 20, no. 3 (February 8, 2019). Accessed August 12, 2020. http://www.irrodl.org/index.php/irrodl/article/view/4299.