The provision of spectacles at low cost / WHO
World Health Organization, 1987
 Buku Teks SO
Gellner, Ernest
Spectacles & predicaments: essays in social theory
Cambridge University Press, 1979
 Buku Teks SO
Machiavelli, Niccolo
Diskursus = The Discourses
Bentang Budaya, 2003
 Buku Teks SO
Machiavelli, Niccolo
The Prince and the discourses
Modern Library, 1950
 Buku Teks SO
Rousseau, Jean-Jacques, 1712-1778
The social contract and the discourses
David Campbell Publishers, 1993
 Buku Referensi