Não informado. (1981). Health technology directions. Program for Appropriate Technology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Health Technology Directions. Seattle, Wash: Program for Appropriate Technology, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Health Technology Directions. Program for Appropriate Technology, 1981.
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