APA (7th ed.) Citation

Nation, R. C. The Zimmerwald Left . the roots of international communism in the First World War.

Chicago Style (17th ed.) Citation

Nation, Robert Craig. The Zimmerwald Left . the Roots of International Communism in the First World War.

MLA (8th ed.) Citation

Nation, Robert Craig. The Zimmerwald Left . the Roots of International Communism in the First World War.

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