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Lua i Stíl Chicago (17ú heag.)Demographic and Health Surveys Program agus Philippines. National Statistics Office. Philippines National Safe Motherhood Survey, 1993. Manila: National Statistics Office, 1994.
Lua MLA (9ú heag.)Demographic and Health Surveys Program agus Philippines. National Statistics Office. Philippines National Safe Motherhood Survey, 1993. National Statistics Office, 1994.
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