Penn, W. (2005). Electrical Estimator's Manual: How to Estimate Electrical Construction Projects Including Everday Labor Installation Rates. Gulf Publishing Company.
Cita Chicago Style (17a ed.)Penn, William. Electrical Estimator's Manual: How to Estimate Electrical Construction Projects Including Everday Labor Installation Rates. Gulf Publishing Company, 2005.
Cita MLA (8a ed.)Penn, William. Electrical Estimator's Manual: How to Estimate Electrical Construction Projects Including Everday Labor Installation Rates. Gulf Publishing Company, 2005.
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