Não informado. (1957). Electrical equipment news. Southam Business Publications.
Chicago-referens (17:e uppl.)Não informado. Electrical Equipment News. Toronto, Canada: Southam Business Publications, 1957.
MLA-referens (8:e uppl.)Não informado. Electrical Equipment News. Southam Business Publications, 1957.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.