The World competitiveness report 1990
The World Economic Forum, 1990
 Buku Teks
Philippine national bibliography 1990
The National Library of The Philippines, 1992
 Buku Referensi
The guinness book of records 1990
editor, Donald McFarlan
Guinness Publishing, 1990
 Buku Referensi
The diplomatic service list 1990
Her Majesty's Stationery Office, 1990
 Buku Referensi
Barone, Michael, author
The almanac of American politics 1990
National Journal, 1992
 Buku Referensi
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