APA

Kenny N., Sunderland P. & Barnes J. (2002). New Proficiency PassKey. Oxford: Macmillan.

Chicago

Kenny N, Sunderland P and Barnes J. 2002. New Proficiency PassKey. Oxford: Macmillan.

Harvard

Kenny N., Sunderland P. and Barnes J. (2002). New Proficiency PassKey. Oxford: Macmillan.

MLA

Kenny N, Sunderland P and Barnes J. New Proficiency PassKey. Oxford: Macmillan. 2002.