TY  - BOOK
AU  - Riley,Peter D.
TI  - Checkpoint science
SN  - 9781444126037 (pbk.)
U1  - 507.1 
PY  - 2011///
CY  - London
PB  - Hodder Education
KW  - Science
KW  - Study and teaching
N1  - "Endorsed by University of Cambridge International Examinations"; Includes index
ER  -