APA Edition Citation

Popper, K. (2013). The two fundamental problems of the theory of knowledge. Routledge.

Chicago Edition Citation

Popper, Karl. The Two Fundamental Problems of the Theory of Knowledge. New York: Routledge, 2013.

MLA Edition Citation

Popper, Karl. The Two Fundamental Problems of the Theory of Knowledge. Routledge, 2013.

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