Cameron, Judy, W. David Pierce, and Sylvia So. “Rewards, Task Difficulty, and Intrinsic Motivation: A Test of Learned Industriousness Theory”. Alberta Journal of Educational Research 50, no. 3 (October 1, 2004). Accessed January 18, 2025. https://dev.journalhosting.ucalgary.ca/index.php/ajer/article/view/55091.