Engineers, A. A. o. C. (1987). Mechanical Estimating Guidebook For Building Construction Editor John Gladstone, Kenneth K. Humpreys. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Engineers, American Association of Cost. Mechanical Estimating Guidebook For Building Construction Editor John Gladstone, Kenneth K. Humpreys. McGraw-Hill, 1987.
Lua MLA (8ú heag.)Engineers, American Association of Cost. Mechanical Estimating Guidebook For Building Construction Editor John Gladstone, Kenneth K. Humpreys. McGraw-Hill, 1987.
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