APA (7th ed.) Citation

Popper, K. (1979). Objective knowledge: An evolutionary approach (Rev. ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Popper, Karl. Objective Knowledge: An Evolutionary Approach. Rev. ed. Oxford: Clarendon Press, 1979.

MLA (9th ed.) Citation

Popper, Karl. Objective Knowledge: An Evolutionary Approach. Rev. ed. Clarendon Press, 1979.