APA (7th ed.) Citation

British Standards Institution. (1963). Guide to the Universal decimal classification (UDC).

Chicago Style (17th ed.) Citation

British Standards Institution. Guide to the Universal Decimal Classification (UDC). London, 1963.

MLA (9th ed.) Citation

British Standards Institution. Guide to the Universal Decimal Classification (UDC). 1963.

Warning: These citations may not always be 100% accurate.