KARPINSKY, A.P. (1922)
Helicoprion ivanovi n. sp. (In Russian) Bulletin de l'Académie des Sciences de Russie, 6. Sér., 16: 369–378
ITANO, W.M. & LUCAS, S.G. (2018)
A revision of Campyloprion Eastman, 1902 (Chondrichthyes, Helicoprionidae), including new occurrences from the Upper Pennsylvanian of New Mexico and Texas, USA. Acta Geologica Polonica, 68 (3): 403–419
ITANO, W.M. & LUCAS, S.G. (2018)
A revision of Campyloprion Eastman, 1902 (Chondrichthyes, Helicoprionidae), including new occurrences from the Upper Pennsylvanian of New Mexico and Texas, USA. Acta Geologica Polonica, 68 (3): 403–419