APA (7th ed.) Citation

(1903). Social-democracy and the Zollverein. The Twentieth Century Press.

Chicago Style (17th ed.) Citation

Social-democracy and the Zollverein. The Twentieth Century Press, 1903.

MLA (8th ed.) Citation

Social-democracy and the Zollverein. The Twentieth Century Press, 1903.

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