Chris, Crawford (1982). "A Taxonomy of Computer Games". The Art of Computer Game Design(PDF). Archived(PDF) from the original on 2014-10-15. Retrieved 2014-12-03.
Chris, Crawford (1982). "A Taxonomy of Computer Games". The Art of Computer Game Design(PDF). Archived(PDF) from the original on 2014-10-15. Retrieved 2014-12-03.