DescriptionKarlPopper2.jpg English: Karl Popper in 1990. Date 3 November 2009 Source https://www.flickr.com/photos/lselibrary/4072388266/ Author Lucinda
DescriptionKarl Popper.svg Nederlands: Portret van Karl Popper (1902-1994) Date 10 October 2007 Source Own work, derived from File:KarlPopper2.jpg Author