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Lua i Stíl Chicago (17ú heag.)ebrary, Inc, agus Richard E. Westney. The Engineer's Cost Handbook: Tools for Managing Project Costs. New York: M. Dekker, 1997.
Lua MLA (9ú heag.)ebrary, Inc, agus Richard E. Westney. The Engineer's Cost Handbook: Tools for Managing Project Costs. M. Dekker, 1997.
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