Não informado. (1957). Industrial power systems. General Electric Company.
Chicago (17e ed.) BronvermeldingNão informado. Industrial Power Systems. Schenectady, NY: General Electric Company, 1957.
MLA (8e ed.) BronvermeldingNão informado. Industrial Power Systems. General Electric Company, 1957.
Let op: Deze citaties zijn niet altijd 100% accuraat.