TY  - BOOK
AU  - Brown, H. Douglas.
AU  - Cohen, Deborah S.
AU  - O'Day, Jennifer
TI  - Challenges: a process approach to academic english : teacher's guide 
SN  - 0130091014 :
U1  - 421.202 
PY  - 1991///
CY  - Englewood Cliffs, New Jersey
PB  - Prentice Hall Inc
KW  -  Academic writing
KW  - Academic writing Problems, exercises, etc
ER  -