Cita APA (7th ed.)

Hashemi, L., & Thomas, B. (2010). Objetive Pet: Student´s book with answers (2nd ed.). Cambridge University Press.

Cita Chicago (17th ed.)

Hashemi, Louise, i Barbara Thomas. Objetive Pet: Student´s Book with Answers. 2nd ed. Cambridge: Cambridge University Press, 2010.

Cita MLA (9th ed.)

Hashemi, Louise, i Barbara Thomas. Objetive Pet: Student´s Book with Answers. 2nd ed. Cambridge University Press, 2010.