Não informado. (1928). Contributions from the Museum of Paleontology. University of Michigan, Museum of Paleontology.
Chicago-referens (17:e uppl.)Não informado. Contributions from the Museum of Paleontology. Ann Arbor, Mich: University of Michigan, Museum of Paleontology, 1928.
MLA-referens (8:e uppl.)Não informado. Contributions from the Museum of Paleontology. University of Michigan, Museum of Paleontology, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.