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Radwanski, A. (1968). Szczatki chimer z albu-cenomanu obrzezenia Gor Swietokrzyskich // Acta Palaeontol. Polon., 13(2): 315-322.

Reif, W.-E. (1974). Metopacanthus sp. (Holocephali) and Palaeospinax egertoni S. Woodward (Selachii) aus dem unteren Toarcium von Holzmaden // Stuttgarter Beitr. Naturk. Ser. B, 10: 9.

Reis, O. M. (1895). On structure of the frontal spine and the rostrolabial cartilages of Squaloraja and Chimaera // Geol. Mag. Lond. IV(II): 385-391.

Richter, M. and Ward, D. J. (1990). Fish remains from the Santa Marta Formation (Late Cretaceous) of James Ross Island, Antarctica // Antarctic Science, 2(1): 67-76.

Riess, J. (1887). Ueber einige fissile Chimaeriden-Reste im Muenchener palaeontologischen Museum // Palaeontographica, 34: 1-27.

Riley, H. (1833). On a fossil in the Bristol Museum, and discovered in the Lias at Lyme Regis // Proc. geol. Soc. London, 1: 483-484.

Riley, H. (1837). On the Squaloraia // Transactions of the Geological Society of London. ser. 2, 5(1): 83-88.

Robb, A. J. (2003). Notes on the occurrence of some petalodont shark fossils from the Upper Pennsylvanian rocks of northeastern Kansas // Transactions of the Kansas Academy of Science, 106(1/2): 71-80.

Robb, A. J., III (1989). The Upper Cretaceous (Campanian, Black Creek Farmation) fossil fish fauna of Phoebus Landing, Bladen Country, North Carolina // The Mosasaurus, 4: 75-92.

Rogovich, A. S. (1860). On the fossil fishes of the gouvernements of the Kiev educational region. - Palaeontology, Systematic part. Kiev.

Romanovsky, H. (1855). Geognostische Beschreibung des Ufers des Flusses Nara // Bull. Soc. Imp. Natur. Moscou 28, part. 1(1): 206-217.

Romanovsky, H. (1864). Descriptions de quelques restes de poissons fossiles trouves dans le calcaire Carbonifere du gouvernement de Toula // Bull. Soc. Imp. Natur. Moscou 37, part 2(3): 157-170.

Rust, D., Elliott, D. et al. (2005). Additions to the vertebrate fauna of the Pennsylvanian (Desmoinesian) Naco formation, Central Arizona // JVP 25. Supplement to No 3. 107A.