Cita APA (7th ed.)

Duffy, H. S. (1930). William Howard Taft. Minton, Balch & company.

Cita Chicago (17th ed.)

Duffy, Herbert Smith. William Howard Taft. New York: Minton, Balch & company, 1930.

Cita MLA (9th ed.)

Duffy, Herbert Smith. William Howard Taft. Minton, Balch & company, 1930.