Stuckman, Jeff, and Guo-Qiang Zhang. “Mastermind Is NP-Complete”. INFOCOMP Journal of Computer Science 5, no. 2 (June 1, 2006): 25–28. Accessed May 7, 2024. https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/130.