APA (7th ed.) Citation
(1943). Universal decimal classification: Classes 50 -51 -52 -53. British standars instituttion.
Chicago Style (17th ed.) Citation
Universal Decimal Classification: Classes 50 -51 -52 -53. London: British standars instituttion, 1943.
MLA (9th ed.) Citation
Universal Decimal Classification: Classes 50 -51 -52 -53. British standars instituttion, 1943.
Warning: These citations may not always be 100% accurate.