TY  - BOOK
AU  - Rao,Digumarti Bhaskara ed.
TI  - International encyclopaedia of science and tecnology education.vol.9
SN  - 81-7141-548-2
U1  - 620.03     ZRao.P;N9 
PY  - 2000///
CY  - New Delhi
PB  - Discovery pub. house
ER  -