edited by Abdul Rashid Moten and Noraini M. Noor
Thomson , 2007
Buku Teks
Blackwell Publishing,
Majalah, Jurnal, Buletin
Jane's Information Group, 1999
Buku Referensi
Whittaker, David J., author
Routledge, 2004
Buku Teks
Toynbee, Arnold J., author
Oxford University Press, 1957
Buku Teks