Cita APA

Butler, G. D. (1936). Playgrounds, their administration and operation: National recreation association. A.S. Barnes.

Citación estilo Chicago

Butler, George D. Playgrounds, Their Administration and Operation: National Recreation Association. New York: A.S. Barnes, 1936.

Cita MLA

Butler, George D. Playgrounds, Their Administration and Operation: National Recreation Association. A.S. Barnes, 1936.

Warning: These citations may not always be 100% accurate.