APA (7th ed.) Citation

De Camp, L. S. (1972). Great cities of the ancient world. Doubleday.

Chicago Style (17th ed.) Citation

De Camp, L. Sprague. Great Cities of the Ancient World. Garden City, N.Y: Doubleday, 1972.

MLA (9th ed.) Citation

De Camp, L. Sprague. Great Cities of the Ancient World. Doubleday, 1972.