Não informado. (1959). Agricultural Aviation. European Agricultural Aviation Center.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Aviation. The Hague, Holanda: European Agricultural Aviation Center, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Aviation. European Agricultural Aviation Center, 1959.
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