Não informado. (2002). Parks & Recreation. National Recreation and Park Association.
Chicago-referens (17:e uppl.)Não informado. Parks & Recreation. Arlington, Va: National Recreation and Park Association, 2002.
MLA-referens (8:e uppl.)Não informado. Parks & Recreation. National Recreation and Park Association, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.