Citação norma APA

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

Citação norma Chicago

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

Citação norma MLA

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

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.