The next-to-last chapter of Popper's 1966 work Objective Knowledge. Contains a concise presentation of his epistemological views.

An interview with Sir Karl Popper, in Italian, with an English summary.

Selected passages from this 1945 work, Popper's most well-known.

Selected correspondence between Thomas Szasz and Popper, between 1961 and 1984.

Text of this 1953 paper by Popper, with hyperlinked footnotes and a later note by the author.

Scanned image of a 1992 letter to Kelley L. Ross.

Text of a 1993 interview giving Popper's take on the contemporary world situation.

Speech delivered by Popper in the Czech Republic shortly before his death.

Text of this key 1953 paper, in which Popper presents the view of the scientific method as a critical, rather than inductive process.

A lecture delivered at the University of Michigan, April 7, 1978.