Não informado. (1935). Planning and Civic Comment. National Conference on State Parks.
Chicago-referens (17:e uppl.)Não informado. Planning and Civic Comment. Washington: National Conference on State Parks, 1935.
MLA-referens (8:e uppl.)Não informado. Planning and Civic Comment. National Conference on State Parks, 1935.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.