Page, J. S. (1984). Conceptual cost estimating manual. Gulf Pub. Co., Book Division.
Lua i Stíl Chicago (17ú heag.)Page, John S. Conceptual Cost Estimating Manual. Houston: Gulf Pub. Co., Book Division, 1984.
Lua MLA (8ú heag.)Page, John S. Conceptual Cost Estimating Manual. Gulf Pub. Co., Book Division, 1984.
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