APA (7th ed.) Citation

Popper, K. R. (1986). Objective knowledge: An evolutionary approach (Rev. ed.). Clarendon Pr.

Chicago Style (17th ed.) Citation

Popper, Karl R. Objective Knowledge: An Evolutionary Approach. Rev. ed. Oxford: Clarendon Pr, 1986.

MLA (9th ed.) Citation

Popper, Karl R. Objective Knowledge: An Evolutionary Approach. Rev. ed. Clarendon Pr, 1986.