Pryde, P. R. (1969). Natural resource management and conservation in the Soviet Union. University Microfilms International.
Chicago-referens (17:e uppl.)Pryde, Philip Rust. Natural Resource Management and Conservation in the Soviet Union. Ann Arbor: University Microfilms International, 1969.
MLA-referens (9:e uppl.)Pryde, Philip Rust. Natural Resource Management and Conservation in the Soviet Union. University Microfilms International, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.