Hogan, P. (1974). Playgrounds for free: The utilization of used and surples materials in playground construction. MIT press.
シカゴスタイル引用形Hogan, Paul. Playgrounds for Free: The Utilization of Used and Surples Materials in Playground Construction. Cambridge: MIT press, 1974.
MLA引用形式Hogan, Paul. Playgrounds for Free: The Utilization of Used and Surples Materials in Playground Construction. MIT press, 1974.
警告: この引用は必ずしも正確ではありません.