	Authors	Year	Title
	Frech	1897-	Lethaea geognostica oder Beschreibung und Abbildung der für die Gebirgs-Formationen bezeichnendsten Versteinerungen. I. Theil. Lethaea palaeozoica. 2. Band. 35pls, 6maps, 551figs.; Stuttgart.
	Gemmellaro	1887	La Fauna dei Calcari con Fusulina della valle del Fiume Sosio (nella Provincia di Palermo). Giornale di scienze naturali ed economiche, 19: 1-106, pl.1-10; Palermo.
	Hayasaka	1965	Some cephalopods in the Permian faunule of Takakura-Yama, Fukushima Prefecture, Japan (with a note on the geology of the District by Ichiro Yanagisiwa and Mamoru Nemoto). Transactions amd Proceedings of the Palaeontological Society of Japan, new series, 57: 8-27, pl.2, 3.