Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (8th εκδ.)

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