Sehgal, R. L. (2004). Introduction to universal decimal classification. Ess Ess.
Chicago Edition CitationSehgal, R L. Introduction to Universal Decimal Classification. New Delhi: Ess Ess, 2004.
MLA Edition CitationSehgal, R L. Introduction to Universal Decimal Classification. Ess Ess, 2004.
Warning: These citations may not always be 100% accurate.