APA (7th ed.) Citation

Trotski, L., & Allen, N. (1975). The challenge of the left opposition (1923-25). New York: Pathfinder Press.

Chicago Style (17th ed.) Citation

Trotski, Leon, and Naomi Allen. The Challenge of the Left Opposition (1923-25). New York: Pathfinder Press, 1975.

MLA (8th ed.) Citation

Trotski, Leon, and Naomi Allen. The Challenge of the Left Opposition (1923-25). New York: Pathfinder Press, 1975.