Wang, J., D. A. Huffaker, J. W. Treem, L. Fullerton, M. A. Ahmad, D. Williams, M. S. Poole, and N. Contractor. “Focused on the Prize: Characteristics of Experts in Massive Multiplayer Online Games”. First Monday, vol. 16, no. 8, July 2011, doi:10.5210/fm.v16i8.3672.