Mollusca 4 : Cephalopoda, Ammonoidea - Arkell, W. J.; Furnish, W. M.; Kummel, Bernhard 1919-; Miller, A. K.; Moore, Raymond Cecil n. 1892; Joint Committee on Invertebrate Paleontology (Lawrence : The Geological Society of America. Inc., 1957)
Keywords: MOLUSCOS FOSILES