Não informado. (2021). Information Services & Use. North-Holland Publishing Company.
Chicago-referens (17:e uppl.)Não informado. Information Services & Use. Amsterdam: North-Holland Publishing Company, 2021.
MLA-referens (8:e uppl.)Não informado. Information Services & Use. North-Holland Publishing Company, 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.