Penn, W. (2005). Electrical estimator's manual: How to estimate electrical construction projects, including everyday labor installation rates. Gulf Pub. Co..
Cita Chicago Style (17a ed.)Penn, William. Electrical Estimator's Manual: How to Estimate Electrical Construction Projects, Including Everyday Labor Installation Rates. Houston, Tex.: Gulf Pub. Co., 2005.
Cita MLA (9a ed.)Penn, William. Electrical Estimator's Manual: How to Estimate Electrical Construction Projects, Including Everyday Labor Installation Rates. Gulf Pub. Co., 2005.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.