Cita APA (7a ed.)

(2010). Upgrade 2: [Bachillerato]. Macmillan Education.

Cita Chicago Style (17a ed.)

Upgrade 2: [Bachillerato]. Oxford: Macmillan Education, 2010.

Cita MLA (9a ed.)

Upgrade 2: [Bachillerato]. Macmillan Education, 2010.