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Karl Popper, Die beiden Grundprobleme der Erkenntnistheorie. Aufgrund von Manuskripten aus den Jahren 1930 - 1933 [The Two Fundamental Problems of the Theory of Knowledge]
- The Literary Encyclopedia. Volume 1.2.1.09: English Writing and Culture: Postwar and Contemporary Britain , 1945-present.
- Vol. editors: Gina Lyle (University of York), Graham MacPhee (University of Manchester), Kerry Myler (Birmingham Newman University), Andrew Radford (University of Glasgow), Jenni Ramone (The Nottingham Trent University)

