Authors	Year	Title
Petersen	1975	Upper Devonian (Famennian) Ammonoids from the Canning Basin, Western Australia. Journal of Paleontology, Mem.8: 1-55, fig.1-27, pl.1-8; Tulsa,Okla.
Petersen & Stokes	1983	A clymeniid ammonoid from the Pinyon Peak limestone of Utah. Journal of Paleontology, 57 (4): 717-719, fig.1-2; Tulsa, Okla.
Petersen, Korn & Kullmann	2000	The Early Mississippian (Osagean) ammonoid Dzhaprakoceras (Cephalopoda) from Utah. Journal of Paleontology, 74 (5): 853-857, 7 text-figs., Lawrence,KS.