Lehman, Thomas M. (1998). «A Gigantic Skull and Skeleton of the Horned Dinosaur Pentaceratops sternbergi from New Mexico». Journal of Paleontology72 (5): 894-906. JSTOR1306666. S2CID132807103. doi:10.1017/S0022336000027220.
Lehman, Thomas M. (1998). «A Gigantic Skull and Skeleton of the Horned Dinosaur Pentaceratops sternbergi from New Mexico». Journal of Paleontology72 (5): 894-906. JSTOR1306666. S2CID132807103. doi:10.1017/S0022336000027220.
Lehman, Thomas M. (1998). «A Gigantic Skull and Skeleton of the Horned Dinosaur Pentaceratops sternbergi from New Mexico». Journal of Paleontology72 (5): 894-906. JSTOR1306666. S2CID132807103. doi:10.1017/S0022336000027220.