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John Hopkins University Press, 1983
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The International Planned Parenthood Federation
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Buku Teks SO
Hart, R.H.
World Health Organization, 1990
Buku Teks SO
Balldin, B.O.
African Medical and Research Foundation, 1975
Buku Teks
Rifkin, Susan B.
World Health Organization, 1990
Buku Teks SO