Leicester University Press, 1997
Buku Teks
Pinkney, Robert, author
Open University Press, 1993
Buku Teks
Millspaugh, Arthur Chester, 1883-1955
The Brookings Institution, 1942
Buku Teks
Carnegie Council on Ethics and International Affairs , 1992
Buku Teks
Noorzila Haji Salleh, author
Arkib Negara Malaysia, 2009
Buku Referensi