APA (7th ed.) Citation

Henderson, W. O. (1959). The Zollverein (2. ed.). Quadrangle Books.

Chicago Style (17th ed.) Citation

Henderson, W. O. The Zollverein. 2. ed. Chicago: Quadrangle Books, 1959.

MLA (9th ed.) Citation

Henderson, W. O. The Zollverein. 2. ed. Quadrangle Books, 1959.

Warning: These citations may not always be 100% accurate.