APA (7th ed.) Citation

Popper, K. R. (1966). The open society and its enemies (5th ed. (revised).). Princeton University Press.

Chicago Style (17th ed.) Citation

Popper, Karl R. The Open Society and Its Enemies. 5th ed. (revised). Princeton, N.J.: Princeton University Press, 1966.

MLA (9th ed.) Citation

Popper, Karl R. The Open Society and Its Enemies. 5th ed. (revised). Princeton University Press, 1966.