Não informado. (1974). Key-word-index of Wildlife Research. Swiss Wildlife Information Service.
Chicago-referens (17:e uppl.)Não informado. Key-word-index of Wildlife Research. Zurich, Suíça: Swiss Wildlife Information Service, 1974.
MLA-referens (8:e uppl.)Não informado. Key-word-index of Wildlife Research. Swiss Wildlife Information Service, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.