APA (7th ed.) Citation

Lensen, G. A. (1967). The Soviet Union: An introduction. Appleton-Century-Crofts.

Chicago Style (17th ed.) Citation

Lensen, George Alexander. The Soviet Union: An Introduction. New York: Appleton-Century-Crofts, 1967.

MLA (9th ed.) Citation

Lensen, George Alexander. The Soviet Union: An Introduction. Appleton-Century-Crofts, 1967.