CRAWFORD, C. M. New products management sixth ed. McGrow-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCRAWFORD, C. Merle. New Products Management Sixth Ed. McGrow-Hill.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCRAWFORD, C. Merle. New Products Management Sixth Ed. McGrow-Hill.
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