Não informado. (1963). Training directors journal. American Society of Training Directors.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Training Directors Journal. Alexandria, Va: American Society of Training Directors, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Training Directors Journal. American Society of Training Directors, 1963.
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