Não informado. (1987). Agricultural Administration and Extension. Elsevier Applied Science.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Administration and Extension. Essex, Inglaterra: Elsevier Applied Science, 1987.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Administration and Extension. Elsevier Applied Science, 1987.
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