APA Citation

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

Chicago Style Citation

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

MLA Citation

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

Warning: These citations may not always be 100% accurate.