Gaya APA

Doff, A., Jones, C. (1998). Language in use : pre-intermediate self-study workbook / Adrian Doff, Christoper Jones (Cet.6). New York: .

Gaya MLA

Doff, Adrian., Jones, Christoper. "Language in use : pre-intermediate self-study workbook / Adrian Doff, Christoper Jones". Cet.6 New York: , 1998. Textbook.