Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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