TY  - BOOK
AU  - Potten,Heather
AU  - Potten,Jonathan
TI  - Clockwise : elementary : classbook
T2  - Short course series
SN  - 9780194340960
PY  - 2001///
CY  - Oxford
PB  - Oxford University Press
KW  - English language
KW  - Textbooks for foreign speakers
KW  - Problems, exercises, etc
KW  - Study and teaching
ER  -