Cita APA

Gilbert, M. (1997). A history of the 20th century: Volume 1 1900-1933. HarperCollins.

Citación estilo Chicago

Gilbert, Martin. A History of the 20th Century: Volume 1 1900-1933. London: HarperCollins, 1997.

Cita MLA

Gilbert, Martin. A History of the 20th Century: Volume 1 1900-1933. HarperCollins, 1997.