Bengtsson, A. (1972). Adventure playgrounds. Crosby Lockwood.
Chicagoスタイル(17版)引用形式Bengtsson, Arvid. Adventure Playgrounds. London: Crosby Lockwood, 1972.
MLA(9版)引用形式Bengtsson, Arvid. Adventure Playgrounds. Crosby Lockwood, 1972.
警告: この引用は必ずしも正確ではありません.