Não informado. (1920). Chemical abstracts. American Chemical Society.
Chicago (17e ed.) BronvermeldingNão informado. Chemical Abstracts. Columbus, Ohio: American Chemical Society, 1920.
MLA (8e ed.) BronvermeldingNão informado. Chemical Abstracts. American Chemical Society, 1920.
Let op: Deze citaties zijn niet altijd 100% accuraat.