Não informado. (1978). Business America. U.S. Department of Commerce.
Chicago (17e ed.) BronvermeldingNão informado. Business America. Washington: U.S. Department of Commerce, 1978.
MLA (8e ed.) BronvermeldingNão informado. Business America. U.S. Department of Commerce, 1978.
Let op: Deze citaties zijn niet altijd 100% accuraat.