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World Bank, 1983
Buku Teks
Journal of Population, 7 (2) 2001 : 37-58, 2001
Artikel Jurnal
Fredy Tjekden, author
Program Pascasarjana Universitas Indonesia, 2009
UI - Tesis (Open)
Gershenson, Harry, author
Society of Actuaries, 1961
Buku Teks
United Nations
1986
Buku Teks