Não informado. (1919). Electrical Power Engineer. Electrical Power Engineers Association.
Chicago-referens (17:e uppl.)Não informado. Electrical Power Engineer. Chertsey, Inglaterra: Electrical Power Engineers Association, 1919.
MLA-referens (8:e uppl.)Não informado. Electrical Power Engineer. Electrical Power Engineers Association, 1919.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.