Witmer, Laurence M. "Nostril Position in Dinosaurs and Other Vertebrates and Its Significance for Nasal Function." Science, New Series, 293/5531 (3 August 2001): 850-853.

Witmer, Laurence M. "Nostril Position in Dinosaurs and Other Vertebrates and Its Significance for Nasal Function." Science, New Series, 293/5531 (3 August 2001): 850-853.