TY  - BOOK
AU  -  Frazier,K.
AU  -  Hoskins,B.
AU  - Graham,C.
TI  - Let's go: Student's Book 4 
SN  - 9780194626217
U1  - 428.24  
PY  - 2007///
CY  - New York
PB  - Oxford University Press, 
KW  - English language
KW  - Textbooks for foreign speakers
KW  - Study and teaching
ER  -