TY  - BOOK
AU  - Sardana, J. L. and Sehgal, R. L.
AU  - Sehgal, R. L. ; jt. auth.
TI  - Universal Decimal Classification; structure and methodology
U1  - 025.432 
PY  - 1983///
CY  - New Delhi
PB  - Ess Ess Publication
ER  -