TY  - BOOK
AU  - Bronkhurst,Martin
AU  - Gower,Jeremy (Illustartions )
TI  - Investigating Light
T2  - Young Scientist
U1  - 032 21
PY  - 1994///
CY  - London
PB  - World Book International
KW  - English Encyclopedias
KW  - دوائر المعارف الإنجليزية
N1  - Encyclopedias
ER  -