Não informado. (2021). Information Services & Use. North-Holland Publishing Company.
Chicago (17e ed.) BronvermeldingNão informado. Information Services & Use. Amsterdam: North-Holland Publishing Company, 2021.
MLA (8e ed.) BronvermeldingNão informado. Information Services & Use. North-Holland Publishing Company, 2021.
Let op: Deze citaties zijn niet altijd 100% accuraat.