एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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