Não informado. (1927). Journal of Paleontology. Society of Economic Paleontologists and Mineralogists.
Chicago-referens (17:e uppl.)Não informado. Journal of Paleontology. Tulsa, Okla: Society of Economic Paleontologists and Mineralogists, 1927.
MLA-referens (8:e uppl.)Não informado. Journal of Paleontology. Society of Economic Paleontologists and Mineralogists, 1927.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.