Oasmann, R. F. (1973). Classification and use of protected natural and cultural areas: A report prepared within the IUCN Secretariat in collaboration with the IUCN Commission on Ecology and International Commission on Natural Parks... International Union for Conservation of Nature and Natural Resources.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Oasmann, R. F. Classification and Use of Protected Natural and Cultural Areas: A Report Prepared Within the IUCN Secretariat in Collaboration with the IUCN Commission on Ecology and International Commission on Natural Parks... Morges, Switzeland: International Union for Conservation of Nature and Natural Resources, 1973.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Oasmann, R. F. Classification and Use of Protected Natural and Cultural Areas: A Report Prepared Within the IUCN Secretariat in Collaboration with the IUCN Commission on Ecology and International Commission on Natural Parks... International Union for Conservation of Nature and Natural Resources, 1973.