found: Rules of play, c2004:t.p. (Eric Zimmerman)
found: The game design reader, c2006:t.p. (Eric Zimmerman) p. 4 of cover (game designer, game design theorist, and the co-founder and CEO of gameLab)
found: OCLC, Dec. 5, 2005(hdg.: Zimmerman, Eric, 1969-)
found: The infinite playground, 2020:eCIP title page (Eric Zimmerman) data view (Eric Zimmerman is an award-winning game designer who has been inventing play on and off the computer for more than 25 years. Eric was the Co-Founder and Chief Design Officer of Gamelab, a game development company based in New York City. Eric is a founder of the Institute of Play)