MLA

Petrov, Vladimir Mihailovich, and Evdokia Petrov. Empire of Fear. New York: Praeger, 1956.

APA

Petrov, V. Mihailovich, & Petrov, E. (1956). Empire of fear. New York: Praeger.

Chicago

Petrov, Vladimir Mihailovich, and Evdokia Petrov. Empire of Fear. New York: Praeger, 1956.