TY  - BOOK
AU  - Heywood, Ian. Cornelius, Sarah. Carver, Steve and Raju, Srin 
TI  - Introduction to geographical information systems 
SN  - 81-7758-784-6 
PY  - 2007///
CY  - Pearson education of asia 
PB  - New Delhi 
KW  - INFORMATION SCIENCE
ER  -