Authors	Year	Title
Lee	1980	Two new Permian ammonoid faunas from Malaysia. Geology and Palaeontology of Southeast Asia (Symposium Tsukuba 1978), volume 21: 63-72, 1 pl.
Lee	1981	Permian ammonoid fauna of Venezuela. Proceedings of the Geological Society of China, 24: 75-86, fig.1-4, pl.1; T'ai-pei, Taiwan.
Miller	1945a	Some exceptional Permian ammonoids from West Texas. Journal of Paleontology, 19 (1): 14-21, fig.1-3, pl.6-8; Tulsa,Oklahoma.