A Year book of the Commonwealth 1986
Foreign and Commonwealth Office
Her Majesty's Stationery Office, 1986
 Buku Referensi
Malaysia year book 1971
Straits Times Press, 1971
 Buku Teks SO
The British year book of international law 1986 : fifty-seventh year of issue
Clarendon Press, 1987
 Buku Referensi
The World almanac and book of facts 1986
Newspaper Enterprise Association, 1985
 Buku Referensi
Remote sensing & geographic information systems year book 95/96
Iwan Gunawan, Lena Sumargana, Nani Hendiarti, Guy Adamsyah
Directorate of technology for natural resources development, 1995
 Buku Referensi