APA (7th ed.) Citation

Popper, K. R., & Havel, V. (2011). The Open society and its enemies. Routledge.

Chicago Style (17th ed.) Citation

Popper, Karl R., and Václav Havel. The Open Society and Its Enemies. Oxon: Routledge, 2011.

MLA (9th ed.) Citation

Popper, Karl R., and Václav Havel. The Open Society and Its Enemies. Routledge, 2011.