Não informado. (2003). Electrical Contracting and Maintenance. Hugh C. Maclean Publications.
Chicago-viite (17. p.)Não informado. Electrical Contracting and Maintenance. Ontario, Canada: Hugh C. Maclean Publications, 2003.
MLA-viite (8. p.)Não informado. Electrical Contracting and Maintenance. Hugh C. Maclean Publications, 2003.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.