Weeks, John R. (John Robert), 1944-, author
Cengage Learning, 2016
Buku Teks
edited by John F. Kantner, Lee McCaffrey
Lexington Books, 1975
Buku Referensi
Population Institute, 1987
Majalah, Jurnal, Buletin
ESCAP , {s.a}
Majalah, Jurnal, Buletin
Jones, Gavin W., author
Irvington, 1975
Buku Teks