Sereno 2000. The fossil record, systematics and evolution of pachycephalosaurs and ceratopsians from Asia. Benton, Michael J.; Shishkin, Mikhail A.; Unwin, David M.; Kurochkin, Evgenii N.[Eds]. The age of dinosaurs in Russia and Mongolia., Cambridge University Press, Cambridge, New York etc., 2000: i-xxxix, 1-696. Chapter pagination: 480-516