APA (7th ed.) Citation

Van Deusen, G. G. (1967). William Henry Seward. Oxford University Press.

Chicago Style (17th ed.) Citation

Van Deusen, Glyndon G. William Henry Seward. New York: Oxford University Press, 1967.

MLA (8th ed.) Citation

Van Deusen, Glyndon G. William Henry Seward. Oxford University Press, 1967.