Gotshaw, F. M. (2000). Journeyman's guide to the National Electrical Code (1999 ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Gotshaw, F. Marco. Journeyman's Guide to the National Electrical Code. 1999 ed. Upper Saddle River, N.J: Prentice Hall, 2000.
Lua MLA (9ú heag.)Gotshaw, F. Marco. Journeyman's Guide to the National Electrical Code. 1999 ed. Prentice Hall, 2000.
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