Cita APA

Butler, G. D. (1960). Playgrounds: Their Administration and Operation. New York: Ronald Press Co..

Citación estilo Chicago

Butler, George D. Playgrounds: Their Administration and Operation. New York: Ronald Press Co., 1960.

Cita MLA

Butler, George D. Playgrounds: Their Administration and Operation. New York: Ronald Press Co., 1960.

Precaución: Estas citas no son 100% exactas.