	Authors	Year	Title
	Shen	1975	[Discovery of primitive ammonoids from Nandan of Guangxi and its stratigraphical significance.] [In Chinese]. Professional Papers of Stratigraphy and Paleontology, 1: 86-104, figs., pl.1-2; Peking.
	Xu & Wei	1977	Fossil Atlas of South-Central China, part 2, Cephalopoda. [In Chinese.] Yichang Institute of Geology and Mineral Resources 1977: p.537-582, pl.204-218, (Geological Publishing House).