Reader in Philosophy, University of The Panjab, 1965
Buku Teks
Hong, Yingming
Elex Media Komputindo, 1993
Buku Teks
Kirk, G.S. (Geoffrey Stephen), 1921-
Cambridge University Press, 1957
Buku Teks
Routledge, 1999
Buku Teks
Park, Joe
Macmillan, [date of publication not identified]
Buku Teks