APA Edition Citation

Popper, K. R., & Hansen, T. E. (2012). The two fundamental problems of the theory of knowledge. Routledge.

Chicago Edition Citation

Popper, Karl R., and Troels Eggers Hansen. The Two Fundamental Problems of the Theory of Knowledge. London ; New York: Routledge, 2012.

MLA Edition Citation

Popper, Karl R., and Troels Eggers Hansen. The Two Fundamental Problems of the Theory of Knowledge. Routledge, 2012.

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