Cita APA

Gilbert, M. (1997). A history of the twentieth century: Vol. 1 1900 - 1933. A history of the twentieth century, 1.1997.

Citación estilo Chicago

Gilbert, Martin. "A History of the Twentieth Century: Vol. 1 1900 - 1933." A History of the Twentieth Century 1997: 1.1997.

Cita MLA

Gilbert, Martin. "A History of the Twentieth Century: Vol. 1 1900 - 1933." A History of the Twentieth Century, 1997, p. 1.1997.