London : Hamish Hamilton Ltd
Majalah, Jurnal, Buletin
Artikel Jurnal
Loomis, Charles P., author
Van Nostrand Comp., 1967
Buku Teks
edited by John C. Caldwell
Dept. of Demography, A.N.U, 1977
Buku Teks
Sik, Kim Byong
International Publisher, 1970
Buku Teks