Não informado. (2003). Electrical Contracting and Maintenance. Hugh C. Maclean Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Electrical Contracting and Maintenance. Ontario, Canada: Hugh C. Maclean Publications, 2003.
Lua MLA (8ú heag.)Não informado. Electrical Contracting and Maintenance. Hugh C. Maclean Publications, 2003.
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