APA (7th ed.) Citation

Van Cleef, E. (1937). Trade centers and trade routes. Appleton-Century.

Chicago Style (17th ed.) Citation

Van Cleef, Eugene. Trade Centers and Trade Routes. New York: Appleton-Century, 1937.

MLA (8th ed.) Citation

Van Cleef, Eugene. Trade Centers and Trade Routes. Appleton-Century, 1937.