1. 2K Boston and 2K Australia. 2007. Bioshock. Game [PC]. 2K Boston and 2K Australia. 2007. Bioshock. Game [PC].
2. Phillip L Ackerman Ruth Kanfer Stacey W Shapiro Sunni Newton and Margaret E Beier. 2010. Cognitive Fatigue During Testing: An Examination of Trait Time-on-Task and Strategy Influences. Human Performance 23 5 (10 2010) 381--402. https://doi.org/10.1080/08959285. 2010.517720 Phillip L Ackerman Ruth Kanfer Stacey W Shapiro Sunni Newton and Margaret E Beier. 2010. Cognitive Fatigue During Testing: An Examination of Trait Time-on-Task and Strategy Influences. Human Performance 23 5 (10 2010) 381--402. https://doi.org/10.1080/08959285. 2010.517720
3. E Adams. 2013. Fundamentals of Game Design. Pearson Education. https://books.google.ca/books?id=Lm1jAgAAQBAJ E Adams. 2013. Fundamentals of Game Design. Pearson Education. https://books.google.ca/books?id=Lm1jAgAAQBAJ
4. Effect of shift in distribution of practice conditions following interpolated rest.