World mortality in 2000: life tables for 191 countries
A.D. Lopez...[et al.
World Health Organization, 2000
 Buku Teks
Hoover`s handbook of world business 1992
edited by Gary Hoover, Acta Campbell, Patrick J, Spain
The Reference Press, 1991
 Buku Referensi
Williams, Neville
Chronology of the modern world 1763 to 1992
Simon & Schuster , 1994
 Buku Referensi
World development report 1992: development and the environment
World Bank
Oxford University Press, 1992
 Buku Teks
World development report 1992: development and the environment
World Bank
New York Oxford University Press 1992,
 Buku Referensi