1. Aguirre-Urreta, M. B. 1998. The ammonites Karakaschiceras and Neohoploceras (Valanginian Neocomitidae) from the Neuquen basin, west-central Argentina. Journal of Paleontology 72(1): 39–59.
2. Becker, R. T., and M. R. House. 1993. New early Upper Devonian (Frasnian) goniatite genera and the evolution of the “Gephurocerataceae”. Berliner geowissenschaftliche Abhandlungen E 9: 111–133.
3. Becker, R. T., and M. R. House. 2000. Devonian ammonoid zones and their correlation with established series and stage boundaries. Courier Forschungsinstitut Senckenberg 220: 113–151.
4. Bhaumik, D., K. Datta, K. Jana-Sudipta, and S. Bardhan. 1993. Taxonomy and intraspecific variation of Macrocephalites formosus (Sowerby) from the Jurassic Chari Formation, Kutch, western India. Journal of the Geological Society of India 42(2): 163–179.
5. Bogoslovsky, B. I. 1958. Devonskie ammonoidei Rudnogo Altaya. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR 64: 1–155.