TY  - GEN
AU  - Singh, Gurdev
TI  - Information sources, services amd systems
SN  - 9788120346390
U1  - 028.7 SIN/Inf 
PY  - 2013///
CY  - Delhi
PB  - PHI Learning Pvt. Ltd
KW  - Reference sources and services
KW  - Information services and systems
N1  - Includes references and index
ER  -