APA (7th ed.) Citation

Clarkson, J. D. (1962). A history of Russia: From the ninth century. Longmans.

Chicago Style (17th ed.) Citation

Clarkson, Jesse D. A History of Russia: From the Ninth Century. London: Longmans, 1962.

MLA (9th ed.) Citation

Clarkson, Jesse D. A History of Russia: From the Ninth Century. Longmans, 1962.