	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.
	Glenister & Furnish	1987	New Permian representatives of ammonoid superfamilies Marathonitaceae and Cyclolobaceae. Journal of Paleontology, 61 (5): 982-998, fig.1-4, 1tab.; Lawrence, Kansas.