Cita APA (7th ed.)
Hough, E. (1918). The Passing of the frontier: A chronicle of the old West.
Cita Chicago (17th ed.)
Hough, Emerson. The Passing of the Frontier: A Chronicle of the Old West. New Haven, 1918.
Cita MLA (9th ed.)
Hough, Emerson. The Passing of the Frontier: A Chronicle of the Old West. 1918.
Atenció: Aquestes cites poden no estar 100% correctes.