APA (7th ed.) Citation

Pickering, S. (1965). 20th century Russia / by S. Pickering. O.U.P..

Chicago Style (17th ed.) Citation

Pickering, S. 20th Century Russia / by S. Pickering. O.U.P., 1965.

MLA (9th ed.) Citation

Pickering, S. 20th Century Russia / by S. Pickering. O.U.P., 1965.

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