Journal of Population, 9 (1) 2003 : 1-50, 2003
Artikel Jurnal
Janson, H.W.
Prentice-Hall, 1966
Buku Referensi
Rossiter, Clinton, 1917-1970, author
A Harbinger Book, 1963
Buku Teks
Foreign Language Press, 1959
Buku Teks
Boudreau, Vince, author
Cambridge University Press, 2004
Buku Teks