TY  - BOOK
AU  - Lena Abdullah ; Lai,Magdalene
TI  - Light, sound, forces and simple machines
T2  - The scientific era series 2
SN  - 9831980530
U1  - 503 23
PY  - 2005///
CY  - Kuala Lumpur : 
PB  - Jade Green Publications , 
KW  - Science - Encyclopedias
ER  -