The provision of spectacles at low cost / WHO
World Health Organization, 1987
 Buku Teks
Gellner, Ernest
Spectacles & predicaments: essays in social theory
Cambridge University Press, 1979
 Buku Teks
Machiavelli, Niccolo
Diskursus = The Discourses
Bentang Budaya, 2003
 Buku Teks
Democracy in Malaysia : Discourses and Practices
edited by Francis Loh Kok Wah
Curzon Press, 2002
 Buku Teks
Machiavelli, Niccolo
The Prince and the discourses / Niccolo Machiavelli
Modern Library, 1950
 Buku Teks