Não informado. (1930). Extension service review. Science and Education Administration.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Extension Service Review. Washington: Science and Education Administration, 1930.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Extension Service Review. Science and Education Administration, 1930.
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