Cita APA (7a ed.)

Popper, K. R. (1972). Objective knowledge: An evolutionary approach. Clarendon Press.

Cita Chicago Style (17a ed.)

Popper, Karl Raimund. Objective Knowledge: An Evolutionary Approach. Oxford: Clarendon Press, 1972.

Cita MLA (9a ed.)

Popper, Karl Raimund. Objective Knowledge: An Evolutionary Approach. Clarendon Press, 1972.