Não informado. (1999). Environmental Science & Technology. American Chemical Society.
Chicago (17e ed.) BronvermeldingNão informado. Environmental Science & Technology. Washington: American Chemical Society, 1999.
MLA (8e ed.) BronvermeldingNão informado. Environmental Science & Technology. American Chemical Society, 1999.
Let op: Deze citaties zijn niet altijd 100% accuraat.