APA (7th ed.) Citation

Diggins, J. P., & Blum, J. M. (1973). The American left in the twentieth century. Harcourt Brace Jovanovich.

Chicago Style (17th ed.) Citation

Diggins, John P., and John Morton Blum. The American Left in the Twentieth Century. New York: Harcourt Brace Jovanovich, 1973.

MLA (8th ed.) Citation

Diggins, John P., and John Morton Blum. The American Left in the Twentieth Century. Harcourt Brace Jovanovich, 1973.