Não informado. (2003). Engineering and contracting. Gillette Publishing Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Engineering and Contracting. Hammond, Ind: Gillette Publishing Company, 2003.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Engineering and Contracting. Gillette Publishing Company, 2003.
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