Howarth, Michael. “Treatise Online No. 128: Part L, Revised, Volume 3B, Chapter 2: Systematic Descriptions of the Jurassic and Cretaceous Phylloceratoidea, Boreophylloceratoidea, and Aequiloboidea”. Treatise Online, Jan. 2020, https://doi.org/10.17161/to.vi.13358.