^ 2.02.1Sánchez, Israel M.; Quiralte, Victoria; Morales, Jorge; Azanza, Beatriz; Pickford, Martin. Sexual dimorphism of the frontal appendages of the early Miocene African pecoran Prolibytherium Arambourg, 1961 (Mammalia, Ruminantia). Journal of Vertebrate Paleontology. 2010, 30 (4): 1306–1310. JSTOR 40864406. doi:10.1080/02724634.2010.483555.