Irmis, Randall B.; Mundil, Roland; Martz, Jeffrey W.; Parker, William G. (2011). "High-resolution U–Pb ages from the Upper Triassic Chinle Formation (New Mexico, USA) support a diachronous rise of dinosaurs". Earth and Planetary Science Letters.309 (3–4): 258–267. doi: 10.1016/j.epsl.2011.07.015
Benson, R. B., Hunt, G. , Carrano, M. T., Campione, N. and Mannion, P. (2018). Cope's rule and the adaptive landscape of dinosaur body size evolution. Palaeontology. 61: 13-48. doi: 10.1111/pala.12329