N.M.Tripathi Private Limited, 1973
Buku Teks
editors, Seamus Hegarty; Mithu Alur
Sage production , 2005
Buku Teks
Pepper, Suzanne, author
Cambridge University Press, 2000
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Journal of Population, 11 (1) 2005 : 19-34, 2008
Artikel Jurnal
Adams, Don, author
Addison-Wesley, 1970
Buku Teks