Gaya APA

Barker, C., Mitchell, L. (2022). Cambridge: Global English Learner's Book 9 (ed. 2). United Kingom (UK): Cambridge University Press.

Gaya MLA

Barker, Chris., Mitchell, Libby. "Cambridge: Global English Learner's Book 9". ed. 2 United Kingom (UK): Cambridge University Press, 2022. Text.