Fernández, M., Fernicola, J.C., Cerdeño, E. & Reguero, M.A. (2018)

Identification of type materials of the species of Protypotherium Ameghino, 1885 and Patriarchus Ameghino, 1889 (Notoungulata: Interatheriidae) erected by Florentino Ameghino

. Zootaxa, 4387 (3), 473–498.