TY  - BOOK
AU  - Chiappetta Eugene L
AU  -  Koballa Thomas R
TI  - Science instruction in the middle and secondary schools:  Developing fundamental knowledge and skills
SN  - 13: 978-0-13-715304-6
PY  - 2010///
CY  - Boston, USA
PB  - Allyn and Bacon
ER  -