Ward-Perkins, J. B. Roman imperial architecture / by J. B. Ward-Perkins. - Harmondsworth, Eng. : Penguin Books, c1981. - 532 p. : ill. ; 21 cm. - The Pelican history of art . Includes index. ISBN: 0140560459 Subjects--Topical Terms: Architecture, Roman. Dewey Class. No.: 722.7