LITERATURE CITED
- Dodson , P. and Currie , P. J. 1990 . “ Neoceratopsia ” . In The Dinosau-ria Edited by: Weishampel , D. B. , Dodson , P. and Osmolska , H. 593 – 618 . Berkeley : University of California Press .
- Hatcher , J. B. , Marsh , O. C. and Lull , R. S. 1907 . The Ceratopsia 300 U.S. Geological Survey Monograph 49
- Lull , R. S. 1933 . A revision of the Ceratopsia or horned dinosaurs. Peabody Museum of Natural History . Memoirs , 3 ( 3 ) : 1 – 175 .
- Paul , G. S. 1988 . Predatory dinosaurs of the world 464 New York : Simon and Schuster .