TY  - BOOK
AU  - Potten,Heather
AU  - Potten,Jonathan
TI  - Clockwise: elementary, Teacher's book 
T2  - Short Course series
SN  - 019434097X
U1  - 428.5 22
PY  - 2002///
CY  - Oxford, New York
PB  - Oxford University Press, 
KW  - English language
KW  - Textbooks for foreign speakers
KW  - Study and teaching
ER  -