penyunting, Abdul Rashid Moten
Cengage Learning, 2008
Buku Teks SO
Milne, R.S.
Federal Publications, 1977
Buku Teks
edited by Zakaria Haji Ahmad
Oxford University Press, 1987
Buku Teks SO
Deutsch, Karl Wolfgang, 1912-1992
Houghton Mifflin, 1970
Buku Teks
Abdul Razak Baginda
Asean Academic Press, 2003
Buku Teks SO