APA (7th ed.) Citation

Thomas, D. Y. (1923). One hundred years of the Monroe doctrine, 1823-1923. Macmillan.

Chicago Style (17th ed.) Citation

Thomas, David Y. One Hundred Years of the Monroe Doctrine, 1823-1923. New York: Macmillan, 1923.

MLA (9th ed.) Citation

Thomas, David Y. One Hundred Years of the Monroe Doctrine, 1823-1923. Macmillan, 1923.