Authors	Year	Title
Leonova & Dmitriev	1989	Rannepermskie ammonoidei Yugo-Vostochnogo Pamira. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 235: 1-198, fig.1-79, pl.1-16; Moskva.
Zhou & Liengjarern	2004	Lower Permian perrinitid ammonoid faunas from Thailand. Journal of Paleontology, 78: 317-339, 18 fig., 4 tab., Lawrence, KS.
Zhou & Yang	2005	Permian ammonoids from Xinjiang, northwest China. Journal of Paleontology, 79 (2): 378-388, 11 fig., 2 tab., Lawrence, KS.