Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Henderson, William Otto. The Zollverein. Chicago: Quadrangle Books, 1959.

Cita MLA (9th ed.)

Henderson, William Otto. The Zollverein. Quadrangle Books, 1959.