Main group 1

• Salen, Katie; Zimmerman, Eric, The game design reader: a rules of play anthology, Cambridge, Mass., MIT Press, cop. 2006
• Lidwell, William.; Holden, Kritina.; Butler, Jill, Universal principles of design: 125 ways to enhance usability, influence perception, increase appeal, make better design decisions, and teach through design, Rev. and updated ed., Gloucester, Mass., Rockport, 2010