Butler, G. D. (1936). Playgrounds, their administration and operation: National recreation association. A.S. Barnes.
Chicagoスタイル(17版)引用形式Butler, George D. Playgrounds, Their Administration and Operation: National Recreation Association. New York: A.S. Barnes, 1936.
MLA(8版)引用形式Butler, George D. Playgrounds, Their Administration and Operation: National Recreation Association. A.S. Barnes, 1936.
警告: この引用は必ずしも正確ではありません.