Não informado. (2001). Studies from the Department of Zoology. University of Nebraska.
Chicago-referens (17:e uppl.)Não informado. Studies from the Department of Zoology. Lincoln, Neb: University of Nebraska, 2001.
MLA-referens (8:e uppl.)Não informado. Studies from the Department of Zoology. University of Nebraska, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.