Ulrich, K. (2008). Product design and development fourth edition. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUlrich, Karl. Product Design and Development Fourth Edition. McGraw-Hill, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUlrich, Karl. Product Design and Development Fourth Edition. McGraw-Hill, 2008.
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