Theodorou, Rod Triceratops had horns and other questions about dinosaurs / Rod Theodorou - London : Kingfisher, c1994. - 32 pages : color illustrations ; 27 cm. - I wonder why . Includes index. ISBN: 9780753405215 Subjects--Topical Terms: Dinosaurs. Dewey Class. No.: R 567.91 T388 1994