APA (7th ed.) Citation

(1922). The Danzig problem: A key to Eastern Europe. Proprietor.

Chicago Style (17th ed.) Citation

The Danzig Problem: A Key to Eastern Europe. London: Proprietor, 1922.

MLA (9th ed.) Citation

The Danzig Problem: A Key to Eastern Europe. Proprietor, 1922.

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