Popper, Karl R., author
Routledge & Kegan Paul, 1972, c. 1969
Buku Teks
Popper, Karl R., author
Routledge, 1961
Buku Teks
edited by H. Aram Veeser
Routledge, 1989
Buku Teks
Hamilton, Paul
Routledge, 1996
Buku Teks
edited and introduced by Richard Wilson and Richard Dutton
Longman, 1992
Buku Teks