Everitt, B.S., author
Chapman & Hall, 1977
Buku Teks
Journal of Population, 11 (2) 2005 : 117-130, 2005
Artikel Jurnal
Montalbono, Michael, author
Science Research Associates, 1974
Buku Teks
Cochrane, Susan H., author
World Bank, 1983
Buku Teks
Hansluwka, Harald, author
[Publisher not identified], 1986
Buku Teks