Não informado. (1969). Journal of Leisure Research. National Recreation and Park Association.
Chicagoスタイル(17版)引用形式Não informado. Journal of Leisure Research. Washington: National Recreation and Park Association, 1969.
MLA(8版)引用形式Não informado. Journal of Leisure Research. National Recreation and Park Association, 1969.
警告: この引用は必ずしも正確ではありません.