APA (7th ed.) Citation

Ketelbey, D. M. (1929). A history of modern times. George G. Harrap.

Chicago Style (17th ed.) Citation

Ketelbey, D. M. A History of Modern Times. London: George G. Harrap, 1929.

MLA (9th ed.) Citation

Ketelbey, D. M. A History of Modern Times. George G. Harrap, 1929.

Warning: These citations may not always be 100% accurate.