British Standards Institution. (1977). Universal decimal classification (2nd English full ed.). British Standard Institution.
Chicago-referens (17:e uppl.)British Standards Institution. Universal Decimal Classification. 2nd English full ed. London: British Standard Institution, 1977.
MLA-referens (8:e uppl.)British Standards Institution. Universal Decimal Classification. 2nd English full ed. British Standard Institution, 1977.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.