Não informado. (1970). National Parks and Conservation Magazine. National Parks & Conservation Association.
Chicago-Zitierstil (17. Ausg.)Não informado. National Parks and Conservation Magazine. Washington: National Parks & Conservation Association, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. National Parks and Conservation Magazine. National Parks & Conservation Association, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.