1. Brown, S. L., & Vaughan, C. C. (2009). Play: How it shapes the brain, opens the imagination, and invigorates the soul. New York: Avery.

 

2. Csikszentmihalyi, M. (1990). Flow: The psychology of optimal experience. Retrieved July 20th, 2016, from http://www.bates.edu/purposeful-work/files/2015/03/Csikszenthmihalyi-1990.pdf

 

3. Lugenbehl, D. (2003). Learning at a Deeper Level. Teaching Philosophy, 26(4), 351-359. doi:10.5840/teachphil200326457

 

4. McGonigal, J. (2011). Reality is broken: Why games make us better and how they can change the world. New York: Penguin Press.

 

5. Moreno-Ger, P., Burgos, D., Martínez-Ortiz, I., Sierra, J. L., & Fernández-Manjón, B. (2008). Educational game design for online education. Computers in Human Behavior, 24(6),  2530-2540. doi:10.1016/j.chb.2008.03.012

 

6. Reinsmith, W. A. (1997). Ten Fundamental Truths About Learning. 6(5), 1-6.