APA (7th ed.) Citation

Ward-Perkins, J. B. (1981). Roman imperial architecture (2nd ed.). Penguin Books.

Chicago Style (17th ed.) Citation

Ward-Perkins, J. B. Roman Imperial Architecture. 2nd ed. Harmondsworth, England ; New York, N.Y.: Penguin Books, 1981.

MLA (9th ed.) Citation

Ward-Perkins, J. B. Roman Imperial Architecture. 2nd ed. Penguin Books, 1981.