TY  - BOOK
AU  - Singh,Gurdev
TI  - Information sources, services and systems / 
SN  - 9788120396390
U1  - 025.52 
PY  - 2013///
CY  - New Delhi : 
PB  - PHI Learning , 
KW  - INFORMATION SERVICES
N1  - Includes bibliography and index
ER  -