Gaya APA

barker, C., mitchell, L. (2014). Cambridge global english for cambridge secondary 1 english as a second language workbook 7 (Ed.7). Cambridge, United Kingdom (Ing: Cambridge university press.

Gaya MLA

barker, Chris., mitchell, Libby. "Cambridge global english for cambridge secondary 1 english as a second language workbook 7". Ed.7 Cambridge, United Kingdom (Ing: Cambridge university press, 2014. Text.