Keuth, Herbert, 1940-
The philosophy of Karl Popper / Herbert Keuth
Cambridge University Press, 2005
 Buku Teks
Flew, Antony, editor
An introduction to Western philosophy: ideas and argument from Plato to Popper / Antony Flew
Thames and Hudson , 1989
 Buku Teks
Corvi, Roberta
An introduction to the thought of karl popper/Roberta Corvi
Routledge, 1997
 Buku Teks
Readings in philosophy
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
 Buku Teks
Russell, Bertrand, 1872-1970
An outline of philosophy
Routledge, 1996
 Buku Teks