Cita APA (7th ed.)
Sumner, W. G., & Keller, A. G. (1911). War and other essays: Ed. with introd. by Albert Galloway Keller.
Cita Chicago (17th ed.)
Sumner, William Graham, i Albert Galloway Keller. War and Other Essays: Ed. with Introd. by Albert Galloway Keller. New Haven, 1911.
Cita MLA (9th ed.)
Sumner, William Graham, i Albert Galloway Keller. War and Other Essays: Ed. with Introd. by Albert Galloway Keller. 1911.
Atenció: Aquestes cites poden no estar 100% correctes.