	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.
	Lambert, Lehrmann & Harris	2000	Correlation of the Road Canyon and Cutoff Formations, West Texas, and Its Relevance to Establishing an International Middle Permian (Guadalupian) Series In: Wardlaw,B.R., Grant,R.E. & Rohr,D.M.: The Guadalupian Symposium, Smithsonian Contributions to the Earth Sciences, 153-183, 4 pl., 11 fig., Washington.
	Miller & Furnish	1957c	Ammonoids from the basal Word Formation, Glass Mountains, West Texas. Journal of Paleontology, 31 (6): 1052-1056, fig.1-2; Tulsa,Oklahoma.