Journal article
The structure and relationships of Protoceratops
Citation
Brown, B.; Schlaikjer, E. M. (1940). The structure and relationships of Protoceratops. Annals of the New York Academy of Sciences 40(3): 133-266. doi:10.1111/j.2164-0947.1940.tb00068.x
Cited by genera
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Protoceratops
Foundational AMNH monograph describing the full ontogenetic series (eggs through aged adults) and arguing for a transitional, near-bipedal pelvic structure in the genus.