National conference on Policy Issues in Outdoor Recreation, Utah, 1966. (1966). Proceedings. Department of the Interior.
Chicago-referens (17:e uppl.)National conference on Policy Issues in Outdoor Recreation, Utah, 1966. Proceedings. Logan, Utah: Department of the Interior, 1966.
MLA-referens (9:e uppl.)National conference on Policy Issues in Outdoor Recreation, Utah, 1966. Proceedings. Department of the Interior, 1966.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.