Authors Year Title
Bogoslovskaya 1986 Ammonoidei. In: Atlas kharakternykh kompleksov Permskoi fauny i flory Urala i Russkoi platformy.
Trudy, novaia seria, 331: 14-15, pl.37-59, (Nedra) Leningrad.
Miller & Unklesbay 1943 The siphuncle in Late Paleozoic amonoids.
Journal of Paleontology, 17 (1): 1-25, fig.1-9, pl.1-5; Tulsa,Oklahoma.
Ruzhencev 1939d Znachenie ontogeneza dlya estestvennoy sistematiki ammonitov. The significance of the ontogeny for the natural system of the ammonoids.]
Istvestiia Akademii Nauk SSSR, seriia biologicheskaia, 1: 13-32, fig.1-7; Moskva.
Ruzhencev 1956 Nizhnepermskiye ammonity Yuzhnogo Urala. II. Ammonity Artinskogo yarusa.
Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 60: 1-275, fig.1-97, pl.1-39; Moskva.
Shigeta, Zakharov & Mapes 2001 Origin of the Ceratitida (Ammonoidea) inferred from the early internal shell features.
Paleontological Research, 5 (3): 201-213, 7 fig.