Cita APA (7th ed.)

Gilbert, M. (1997). A history of the twentieth century. W. Morrow.

Cita Chicago (17th ed.)

Gilbert, Martin. A History of the Twentieth Century. New York: W. Morrow, 1997.

Cita MLA (9th ed.)

Gilbert, Martin. A History of the Twentieth Century. W. Morrow, 1997.