APA (7th ed.) Citation

Roberts, G., & Roberts, G. K. (1989). The unholy alliance: Stalin's pact with Hitler. Tauris.

Chicago Style (17th ed.) Citation

Roberts, Geoffrey, and Geoffrey K. Roberts. The Unholy Alliance: Stalin's Pact with Hitler. London: Tauris, 1989.

MLA (8th ed.) Citation

Roberts, Geoffrey, and Geoffrey K. Roberts. The Unholy Alliance: Stalin's Pact with Hitler. Tauris, 1989.