APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Cleef, Eugene van. Trade Centers and Trade Routes. New York [u.a.]: Appleton-Century, 1937.

MLA (9th ed.) Citation

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