Scanned image of a 1992 letter to Kelley L. Ross.
Text of this key 1953 paper, in which Popper presents the view of the scientific method as a critical, rather than inductive process.
The next-to-last chapter of Popper's 1966 work Objective Knowledge. Contains a concise presentation of his epistemological views.
Text of a 1993 interview giving Popper's take on the contemporary world situation.
Selected correspondence between Thomas Szasz and Popper, between 1961 and 1984.
Speech delivered by Popper in the Czech Republic shortly before his death.
Selected passages from this 1945 work, Popper's most well-known.
An interview with Sir Karl Popper, in Italian, with an English summary.
Text of this 1953 paper by Popper, with hyperlinked footnotes and a later note by the author.
A lecture delivered at the University of Michigan, April 7, 1978.