penyunting, Richard H. Chauvel; penerjemah, Sujinah Harlinah; Ismu
Yayasan Obor Indonesia , 1992
Buku Teks SO
Australia : The Australian Institute Politica Sciencel, {s.a}
Majalah, Jurnal, Buletin
Wright, Vincent
New York Holmes [t.th.]
Buku Teks
Williams, E.N.
Penguin Books, 1970
Buku Teks
Crisp, L.F. (Leslie Finlay)
Yale University Press, 1949
Buku Teks SO