GLADSTONE, J. Mechanical Estimating Guide Book John Gladstone, Kenneth K. Humphreys. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)GLADSTONE, John. Mechanical Estimating Guide Book John Gladstone, Kenneth K. Humphreys. McGraw-Hill.
Lua MLA (8ú heag.)GLADSTONE, John. Mechanical Estimating Guide Book John Gladstone, Kenneth K. Humphreys. McGraw-Hill.
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