Não informado. (1960). Production Engineers. Institution of Production Engineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Production Engineers. London: Institution of Production Engineers, 1960.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Production Engineers. Institution of Production Engineers, 1960.
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