Cita APA (7th ed.)

Hashemi, L., & Thomas, B. (2008). Grammar for first certificate with answers (2a. ed.). Cambridge University Press.

Cita Chicago (17th ed.)

Hashemi, Louise, i Barbara Thomas. Grammar for First Certificate with Answers. 2a. ed. Cambridge: Cambridge University Press, 2008.

Cita MLA (9th ed.)

Hashemi, Louise, i Barbara Thomas. Grammar for First Certificate with Answers. 2a. ed. Cambridge University Press, 2008.