Não informado. (1970). Extension news. Virginia Polytechnic Institute and State University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Extension News. Blacksburg, Va: Virginia Polytechnic Institute and State University, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Extension News. Virginia Polytechnic Institute and State University, 1970.
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