Middleton, Neil
Pluto Press, 1993
Buku Teks
The population council, 1977
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National Academy of Science, 1974
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Amena Mohsin
YJP Press, 2016
Artikel Jurnal
edited by Frances Stewart, Ruhi Saith, Barbara Harriss-White
Palgrave Macmillan, 2007
Buku Teks