	Authors	Year	Title
	Bogoslovskaya	1990	Osnovye puti razvitiya i klassifikatsiya pozdnepaleozoyskikh ammonoidey Marathonitaceae i Cyclolobaceae. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 243: 70-86, fig.1-3; Moskva.
	Ehiro, Shimoyama & Murata	1986	Some Permian Cyclolobaceae from the Southern Kitakami Massif, Northeast Japan. Transactions and Proceedings of the Palaeontological Society of Japan, N.S., 142: 400-408, fig.1-4, pl.79-80; Tokyo.
	Ehiro	1998	Ammonoid biostratigraphy of the Middle Permian in the South Kitakmi Belt, Japan, and correlation with the reference sections on the Tethyan Region and North America. Proceedings of the Royal Society of Victoria, 110 (1/2): 147-156, 4 figs., Melbourne.
	Hayasaka	1954	Younger Paleozoic cephalopods from the Kitakami Mountains, Japan. Journal of the Faculty of Science, Hokkaido University, (4) 8: 361-374, pl.22-23.
	Wanner	1932	Zur Kenntnis der permischen Ammonoidennfauna von Timor. Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Beilage-Band B 67: 257-278, fig.1, pl.9-11; Stuttgart.
	Wolburg	1933	Das Devon im Gebiet der oberen Lenne. Abhandlungen der Preußischen Geologischen Landesanstalt, Neue Folge, 151: 1-70, fig.1-10, tab.1-3, pl.1-3; Göttingen.