Schrage, Michael. Serious play : how the world's best companies simulate to innovate / Michael Schrage. - Boston, mass. : Harvard Business School Press, 2000. - xxiv, 244 p. ; 24 cm. ISBN: 0875848141 (alk. paper) LCCN: 99023757 LC Class. No.: HD45 .S368 2000 / .S368 2000 Dewey Class. No.: 658.4/0352