^Thornton, Stephen (2015-01-01). Zalta, Edward N. (ed.). Karl Popper (Winter 2015 ed.). ("Popper professes to be anti-conventionalist, and his commitment to the correspondence theory of truth places him firmly within the realist's camp.")
^Hacohen, Malachi Haim. Karl Popper – The Formative Years, 1902–1945: Politics and Philosophy in Interwar Vienna. Cambridge University Press, 2000. pp. 83–85.