Cita APA

Ellis, M. J. 1. (2011). Why people play. Urbana Ill: Sagamore Publishing.

Citación estilo Chicago

Ellis, Michael J. 1936-. Why People Play. Urbana Ill: Sagamore Publishing, 2011.

Cita MLA

Ellis, Michael J. 1936-. Why People Play. Urbana Ill: Sagamore Publishing, 2011.