Cita APA

Popper, K. R. 1., & Popper, K. R. 1. (1972). Objective knowledge: An evolutionary approach. Oxford: Clarendon Press.

Citación estilo Chicago

Popper, Karl Raimund 1902-1994, y Karl Raimund 1902-1994 Popper. Objective Knowledge: An Evolutionary Approach. Oxford: Clarendon Press, 1972.

Cita MLA

Popper, Karl Raimund 1902-1994, y Karl Raimund 1902-1994 Popper. Objective Knowledge: An Evolutionary Approach. Oxford: Clarendon Press, 1972.