APA (7th ed.) Citation

Butler, G. D. (1950). Playgrounds, their administration and operation (Revised edition.). Ronald Press.

Chicago Style (17th ed.) Citation

Butler, George D. Playgrounds, Their Administration and Operation. Revised edition. New York: Ronald Press, 1950.

MLA (9th ed.) Citation

Butler, George D. Playgrounds, Their Administration and Operation. Revised edition. Ronald Press, 1950.