Template:Arkell et al., 1957
- Arkell, W.J., Moore, R.C., Miller, A.K., Furnish, W.M. & Schindewolf, O.H. 1957. Treatise on Invertebrate Paleontology, Part L, Mollusca 4: Cephalopoda, Ammonoidea. Geological Society of America, Boulder, CO; 490 pp. Full text