Authors Year Title
Furnish, Glenister & Kullmann 2009 Carboniferous and Permian Ammonoidea.(Goniatitida and Prolecanitida    ( Authors: W.M.Furnish, B.F. Glenister, Jürgen Kullmann and  Zhou  Zuren.)
Treatise on Invetebrate Paleontology,part L, Mollusca 4, Revised, volume 2, Carboniferous and Permian Ammonoidea,1-258, 139 fig., Lawrence, KS.
Weyer 1972 Zum Alter der Ammonoideen-Faunen des Marshall-Sandsteins (Unterkarbon; Michigan, USA).
Berichte der deutschen Gesellschaft der geologischen Wissenschaften, A, Geol. Paläont., 17 (3): 325-350, 1 fig., 1 tab.; Berlin.