APA (7th ed.) Citation

British Standards Institution. (1977). Universal decimal classification (2nd English full ed.). British Standard Institution.

Chicago Style (17th ed.) Citation

British Standards Institution. Universal Decimal Classification. 2nd English full ed. London: British Standard Institution, 1977.

MLA (8th ed.) Citation

British Standards Institution. Universal Decimal Classification. 2nd English full ed. British Standard Institution, 1977.