Não informado. (2000). Library conservation news. British Library, National Preservation Office.
Chicago-referens (17:e uppl.)Não informado. Library Conservation News. London: British Library, National Preservation Office, 2000.
MLA-referens (8:e uppl.)Não informado. Library Conservation News. British Library, National Preservation Office, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.