Brown, H. Douglas. Challenges : a process approach to academic english : teacher's guide / [by] H. Douglas Brown. Deborah, S. Cohen. Jennifer O'Day. - Englewood Cliffs, New Jersey : Prentice Hall Inc, c 1991. - viii, 93 p. ; 28 cm. ISBN: 0130091014 : Subjects--Topical Terms: Academic writing,Academic writing Problems, exercises, etc Dewey Class. No.: 421.202 / BRO