edited by Andrew Belsey and Ruth Chadwick
Routledge, 1995
Buku Teks SO
Hao Xiaoming; Sunanda K. Datta-Ray
Marshall Cavendish, 2006
Buku Teks SO
C. Christhopher
Anmol Publicatioans PVT. ltd, 1997
Buku Teks SO
Ferguson, Donald L.
National Textbook, 1994
Buku Teks SO
Artikel Jurnal