APA (7th ed.) Citation

Warren, H. G. (1972). The sword was their passport: A history of American filibustering in the Mexican revolution. Kennikat Press.

Chicago Style (17th ed.) Citation

Warren, Harris Gaylord. The Sword Was Their Passport: A History of American Filibustering in the Mexican Revolution. Port Washington, N.Y.: Kennikat Press, 1972.

MLA (9th ed.) Citation

Warren, Harris Gaylord. The Sword Was Their Passport: A History of American Filibustering in the Mexican Revolution. Kennikat Press, 1972.