Authors	Year	Title
Davis	1972	Mature modifications and dimorphism in selected Late Paleozoic ammonoids. Bulletins of American Paleontology, 62 (272): 27-130, pls.3-21, Ithaca, NY.
Miller & Furnish	1940c	Permian ammonoids of the Guadalupe Mountain Region and adjacent areas. Special Papers of the Geological Society of America, 26: 1-242, fig.1-59, pl.1-44; Baltimore.
Miller	1945a	Some exceptional Permian ammonoids from West Texas. Journal of Paleontology, 19 (1): 14-21, fig.1-3, pl.6-8; Tulsa,Oklahoma.