TY  - BOOK
AU  - Katz,WilliamA, ----
AU  - 
TI  - Introduction to reference work ;basic information sources : ----
SN  -  
U1  - REF.025.52/INT    
PY  - 1969///
CY  - N.Y
PB  - McgrawHill
KW  - Libraries
KW  - Referrence-Service
ER  -