Wang, Jing, David A. Huffaker, Jeffrey W. Treem, Lindsay Fullerton, Muhammad A. Ahmad, Dmitri Williams, Marshall Scott Poole, and Noshir Contractor. “Focused on the Prize: Characteristics of Experts in Massive Multiplayer Online Games”. First Monday 16, no. 8 (July 18, 2011). Accessed December 6, 2021. https://journals.uic.edu/ojs/index.php/fm/article/view/3672.