Authors Year Title
Pabian, Boardman & Mapes 1983 Late Pennsylvanian (Missourian, Virgilian) ammonoids from Southeastern Nebraska.
Proceedings of the Nebraska Academy of Science, 93th Annual Meeting, 1983: 48.
Zhou 1987 Early Permian ammonoid-fauna from southeastern Hunan. [In Chinese, with English abstract].
In: Nanjing Institute of Geology and Paleontology,Academia Sinica, ed.,Collection of Postgraduate Theses, 1: 285-348,33 fig., 9 pl. (Jiangsu Sci. and Technol.Publ.House), Nanjing