- Karl Popper: A Critical Appraisal by Philip Catton, 2004-12-03
- Karl R. Popper (Grosse Denker) by Lothar Schafer, 1988
- Notes on Karl Popper.(Brief biography): An article from: Modern Age by Philip Brantingham, 2007-01-01
- Realism and the Aim of Science: From the Postscript to the Logic of Scientific Discovery by Karl Popper, 1992-04-10
- Popper: The Great Philosophers (The Great Philosophers Series) by F. Raphael, 1999-07
- Essays On Realism And Rationalism.(Schriftenreihe zur Philosophie Karl R. Poppers und des Kritischen Rationalismus/Series in the Philosophy of Karl R. ... of Karl R.Popper & Critical Rationalism) by Alan Musgrave, 1999-01
- Karl Popper's Philosophy of Science: Rationality without Foundations (Routledge Studies in the Philosophy of Science) by Stefano Gattei, 2008-08-01
- Truth, Hope, and Power: The Thought of Karl Popper by Douglas E. Williams, 1989-01
- The Ethical Nature of Karl Popper's Theory of Knowledge: Including Popper's unpublished comments on Bartley and critical rationalism by Mariano Artigas, 1999-09
- Altern Und Alterssicherung Aus Wissenschaftlicher Sicht (Schriftenreihe Der Karl Popper Foundation Klagenfurt) by Reinhard Neck, 2003-01-31
- Karl Popper : Un philosophe heureux by Michèle-Irène Brudny, 2002-03-13
- Social work method: Karl Popper "justified," induction (justification) falsified--a response to Eileen Munro.: An article from: Journal of Social Work Education by Tomi Gomory, 2002-09-22
- Learning from Error: Karl Popper's Psychology of Learning by William Berkson, John Wettersten, 1984-10
- Rationalitat und Begrundung: Das Grundlagenproblem in der Philosophie Karl Poppers (Mainzer philosophische Forschungen) by Heinz Weinheimer, 1986
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