APA (7th ed.) Citation

Gregor, A. S. (1967). How the world's first cities began. Dutton.

Chicago Style (17th ed.) Citation

Gregor, Arthur S. How the World's First Cities Began. New York: Dutton, 1967.

MLA (9th ed.) Citation

Gregor, Arthur S. How the World's First Cities Began. Dutton, 1967.