Hospers, John, author
Roudledge, 1988
Buku Teks
Pisarev, Dmitry, author
Foreign Languages Publishing House, 1958
Buku Teks
Chernyshevsky, N. G.
Foreign Languages Publishing House, 1953
Buku Teks
Keuth, Herbert, author
Cambridge University Press, 2005
Buku Teks
George allen & Unwin, ltd, 1948
Buku Teks