TY  - BOOK
AU  - Koh, Andy
AU  - Goh, Valerie 
TI  - Earth our home : : Secondary 1 teacher's guide 
SN  - 9789810112912
AV  - G128 
U1  - 910 
PY  - 2006///.
CY  - New York
PB  - Marshall Cavendish Education
ER  -