The Two Fundamental Problems of the Theory of Knowledge, 1930–1933 (as a typescript circulating as Die beiden Grundprobleme der Erkenntnistheorie; as a German book 1979, as English translation 2008), আই.এচ.বি.এন.0415394317
Knowledge and the Mind-Body Problem: In Defence of Interaction (edited by Mark Amadeus Notturno) 1994 আই.এচ.বি.এন.0415115043
The World of Parmenides, Essays on the Presocratic Enlightenment, 1998, Edited by Arne F. Petersen with the assistance of Jørgen Mejer, আই.এচ.বি.এন.0415173019
After The Open Society, 2008. (Edited by Jeremy Shearmur and Piers Norris Turner, this volume contains a large number of Popper's previously unpublished or uncollected writings on political and social themes.) আই.এচ.বি.এন.978-0415309080
Frühe Schriften, 2006 (Edited by Troels Eggers Hansen, includes Popper's writings and publications from before the Logic, including his previously unpublished thesis, dissertation and journal articles published that relate to the Wiener Schulreform.) আই.এচ.বি.এন.978-3161476327
↑ 2.02.12.2Thornton 2015 : "Popper professes to be anti-conventionalist, and his commitment to the correspondence theory of truth places him firmly within the realist's camp".