Não informado. (2003). Engineering and contracting. Gillette Publishing Company.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Engineering and Contracting. Hammond, Ind: Gillette Publishing Company, 2003.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Engineering and Contracting. Gillette Publishing Company, 2003.
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