APA Style

Wilson, W, ;, B, R. (). Fifty-fifty Intro : An Introductory Course in Communicative English . : Longman Asia ELT, Hong Kong. 1998.

MLA Style

Wilson, Warren, ;, Barnard,, Roger. "Fifty-fifty Intro : An Introductory Course in Communicative English". : Longman Asia ELT, Hong Kong. 1998, . BOOK.