APA (7th ed.) Citation

Butler, G. (1950). Playgrounds: Their administration and operation (Rev. ed.). Ronald Press.

Chicago Style (17th ed.) Citation

Butler, George. Playgrounds: Their Administration and Operation. Rev. ed. New York: Ronald Press, 1950.

MLA (9th ed.) Citation

Butler, George. Playgrounds: Their Administration and Operation. Rev. ed. Ronald Press, 1950.