Arkell, W. J.; Furnish, W. M.; Kummel, B.; Miller, A. K.; Moore, R. C.; Schindewolf, O. H. (1957). Part L, Mollusca 4: Cephalopoda, Ammonoidea. In Moore, R. C. (Ed.) Treatise on Invertebrate Paleontology. Geol. Soc. Am., Univ. Kansas Press, Lawrence.
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Arkell, W. J.; Furnish, W. M.; Kummel, B.; Miller, A. K.; Moore, R. C.; Schindewolf, O. H.
1957
Part L, Mollusca 4: Cephalopoda, Ammonoidea. In Moore, R. C. (Ed.) Treatise on Invertebrate Paleontology. Geol. Soc. Am., Univ. Kansas Press, Lawrence.