APA (7th ed.) Citation

Popper, K. R. (1966). The open society and its enemies (5th ed., rev.). Routledge and Kegan Paul.

Chicago Style (17th ed.) Citation

Popper, Karl R. The Open Society and Its Enemies. 5th ed., rev. London: Routledge and Kegan Paul, 1966.

MLA (9th ed.) Citation

Popper, Karl R. The Open Society and Its Enemies. 5th ed., rev. Routledge and Kegan Paul, 1966.