	Authors	Year	Title
	Böse	1919	The Permo-Carboniferous ammonoids of the Glass Mountains, west Texas, and their stratigraphical significance. [1919, inscribed 1917]. University of Texas Bulletin, 1762: 1-241, 11 pl., Austin,Texas.
	Ehiro & Misaki	2005	Middle Permian ammonoids from the Kamiyasse-Imo district in the Southern Kitakami Massif, Northeast Japan. Paleontological Research, 9: 1-14, 9 fig.
	Girty	1908	The Guadalupian Fauna. Professional Papers, U.S. Geological Survey, 58: 1-651, pl.1-31; Washington.
	González-Arreola, Villaseñor-Martínez & Corona-Esquivel	1994	Permian Fauna of the Los Arcos Formation, Municipality of Olinalá, State of Guerrero, Mexico. Revista Mexicana de Ciencias Geológicas, 11: 214-221, 2 text-figs., 3 pls., Mexico.
	Hayasaka	1940	On Two Permian Ammonoids from the Kitakami Mountains, North Japan. Journal of the Geological Society of Japan, (565) 47: 422-427, 3 fig.
	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.
	King, Dunbar & Cloud	1944	Geology and Paleontology of the Permian area northwest of Las Delicias, southwestern Coahuila, Mexico. [King,R.E., Dunbar,C.O., Cloud,P. & Miller,A.K.] Geological Society of America Special Papers, 52: X + 1-172, 29 text-figs., 45 pls.
	Korn, Ebbighausen & Bockwinkel	2003	The A-mode sutural ontogeny in prolecanitids ammonoids. [Korn,D., Ebbighausen,V., Bockwinkel,J. & Klug,C.] Palaeontology 46 (6): 1123-1132, 8 fig., London.
	Liang & Guo	1982	Cephalopoda. Paleontological Atlas of East China. Volume of Late Paeozoic: 257-307, fig.1-90, pl.103-118; Beijing.
	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.
	Plummer & Scott	1937	Upper Paleozoic ammonites in Texas. The geology of Texas, vol.3 pt.1, Bull. Texas. Univ., 3701: 1-516, fig.1-88, pl.1-41; Austin, Texas.
	Shigeta, Zakharov & Mapes	2001	Origin of the Ceratitida (Ammonoidea) inferred from the early internal shell features. Paleontological Research, 5 (3): 201-213, 7 fig.
	Spinosa, Furnish & Glenister	1975	The Xenodiscidae, Permian ceratitoid ammonoids. Journal of Paleontology, 49 (2): 239-283, fig.1-22, tab.1-5, pl.1-8.
	Xu	1979	Late Lower Permian strata and ammonoids in Central Guangdong. [In Chinese]. Contributions to Stratigraphy and Palaeontology, Yichang Institute of Geology and Mineral Resources 1979: 34-45, 3 fig., 1 pl.
	Zhao & Zheng	1977	The Permian ammonoids from Zhejiang and Jiangxi. Acta Palaeontologica Sinica, 16 (2): 217-254, 20 figs., pl.1-5; Beijing.
	Zheng	1984	Some Permian ammonoids from Hunan and Northern Guangdong. [In Chinese, with English summary]. Acta Paleontologica Sinica, 23 (2): 185-195, fig.1-8, pl.1-2; Beijing.