Citazione Stile APA (7a Edizione)

POPPER, K. R. (1979). Objective knowledge: An evolutionary approach (2nd ed.). Clarendon.

Citazione stile Chigago Style (17a edizione)

POPPER, Karl R. Objective Knowledge: An Evolutionary Approach. 2nd ed. Oxford: Clarendon, 1979.

Citatione MLA (9a ed.)

POPPER, Karl R. Objective Knowledge: An Evolutionary Approach. 2nd ed. Clarendon, 1979.