Não informado. (1969). Journal of Leisure Research. National Recreation and Park Association.
Chicago-referens (17:e uppl.)Não informado. Journal of Leisure Research. Washington: National Recreation and Park Association, 1969.
MLA-referens (8:e uppl.)Não informado. Journal of Leisure Research. National Recreation and Park Association, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.