Journal of Population, 13(1) 2007 : 1-12, 2007
Artikel Jurnal
United Nations Development Programme, 1980
Buku Teks SO
Afsghar, Haleh
Longman, 1991
Buku Teks
edited by Glen Chandler, Norma Sullivan and Jan Branson
Monash University, 1988
Buku Teks SO
Yang, Feng
People's Publishing House, 2009
Buku Teks