Olsen, Paul E.; Baird, Donald (1986). "The ichnogenus Atreipus and its significance for Triassic Biostratigraphy" (PDF). In Padian, Kevin (ed.). The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic-Jurassic Boundary. New York: Cambridge University Press. pp. 61–87. ISBN 978-0521367790. Retrieved 2024-12-27. 978-0521367790