TY  - BOOK
AU  - Bolton,David
AU  - Oxenden,Clive
AU  - Peterson,Len
TI  - OK 4: workbook 
SN  - 0194323668
U1  - 428.4076 
PY  - 1990///
CY  - Oxford, U.K.
PB  - Oxford University Press
KW  - English language
KW  - Grammar
KW  - Problems, exercises, etc
KW  - Textbooks for foreign speakers
N1  - Accompanied by : Set of 2 sound cassettes : Cassette 1 (45 min.) : Unit 1-6 - Cassette 2 (45min) : Unit 7- 12. ISBN 0194323684
ER  -