Cita APA

Popper, k. R. (2009). The two fundamental problems of the theory of knowledge. London: Routledge.

Citación estilo Chicago

Popper, karl Raimund. The Two Fundamental Problems of the Theory of Knowledge. London: Routledge, 2009.

Cita MLA

Popper, karl Raimund. The Two Fundamental Problems of the Theory of Knowledge. London: Routledge, 2009.