Prior's review of G.H. Duggan's book Evolution and philosophy, published in NZ Listener on 9 December 1949, p. 17. This review would trigger a long debate in NZ Listener, entitled "How things began".
A letter from the W.E.A. to Popper, dated 1 March 1939, telling him that he was recommended to teach a course for W.E.A.'s Christchurch classes in 1939.
A letter from Popper to the secretary of the W.E.A, dated 4 March 1939, in response to KP8080. Popper said he was pleased to be invited to teach philosophy for the W.E.A.
A report to the W.E.A. executive meeting on Friday 19 May 1939, in which Popper was listed as one of the suggested lecturers to lecture at Paparua Prison.
A notice of the W.E.A. classes that states the title, time, location, and name of the tutor for each of the 13 classes. Popper's class was scheduled on Tuesdays.