	Authors	Year	Title
	Erben	1965	Die Evolution der ältesten Ammonoidea. II. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 122 (3): 275-312, fig.1-13, pl.25-27; Stuttgart.
	Xian, Wang & Zhou	1980	Nandan typical stratigraphy and paleontology of Devonian in South China. Ammonoidea. Guizhou People's Publishing House, 100-110, pl.32-35, Guiyang 1980.