Bandar Seri Begawan Brunei Press 2001,
Buku Referensi
Goverment Information Office, 2002
Buku Referensi
Bangkok Secretariat Association of Southeast Asian Institutions Chulalongkorn University 1957
Buku Teks
Mackinnon, John Ramsay
[publisher not identified], [date of publication not identified]
Buku Teks
Robinson, Danielm
Lonely Publications Pty Ltd, 2011
Buku Referensi