APA (7th ed.) Citation

Gilbert, M. (1997). A history of the twentieth century: Volume one: 1900 -1933. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Gilbert, Martin. A History of the Twentieth Century: Volume One: 1900 -1933. London: HarperCollins Publishers, 1997.

MLA (9th ed.) Citation

Gilbert, Martin. A History of the Twentieth Century: Volume One: 1900 -1933. HarperCollins Publishers, 1997.