English language Services & Koch, P. (1984). Engineering: Civil and mechanical engineering. Macmillan Publishing Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEnglish language Services और Paul Koch. Engineering: Civil and Mechanical Engineering. New York,NY: Macmillan Publishing Company, 1984.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEnglish language Services और Paul Koch. Engineering: Civil and Mechanical Engineering. Macmillan Publishing Company, 1984.
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