Hertsgaard, Mark
Schoken Books, 1989
Buku Teks SO
edited by John L. Palmer
Urban Institute Press, 1986
Buku Teks SO
Dye, Thomas R.
Pearson, 2014
Buku Teks
edited, John B. Williamson, Linda Evans and Michael Rustad
Little, Brown, 1985
Buku Teks SO
Currie, Elliott
Little, Brown, 1984
Buku Teks SO