Kampmann Walther, Bo, and Lasse Juel Larsen. “Reflections on Ludification: Approaching a Conceptual Framework – And Discussing Inherent Challenges”. International Journal of Serious Games 8, no. 3 (September 17, 2021): 115–127. Accessed October 27, 2021. https://journal.seriousgamessociety.org/index.php/IJSG/article/view/436.