Allen & Unwin, 1986
Buku Teks SO
Shakespeare, William, 1564-1616
London Methuen 1980,
Buku Teks
E & FN Spon, 1996
Buku Teks
edited by Kay P. Bland
Hi Willow Research and Publishing, 1990
Buku Referensi
The Academy of Political Science, 1977
Buku Teks SO