Karl Popper Quotes about Freedom
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Karl Raimund Popper (2002). “Conjectures and Refutations: The Growth of Scientific Knowledge”, p.464, Psychology Press
Karl Popper (2013). “All Life is Problem Solving”, p.92, Routledge
The Open Society and its Enemies (1945) vol. 2, ch. 21
Karl Popper (2013). “All Life is Problem Solving”, p.92, Routledge