(1967). Engineering: An Introduction To A Creative Profession / George C. Beakley , H. W. Leach. the Macmillan Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEngineering: An Introduction To A Creative Profession / George C. Beakley , H. W. Leach. the Macmillan Company, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEngineering: An Introduction To A Creative Profession / George C. Beakley , H. W. Leach. the Macmillan Company, 1967.
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