Cita APA (7th ed.)

Metcalf, R., Cavey, C., & Greenwood, A. (2011). English unlimited: Upper intermediate. Self-study pack, Workbook with DVD-ROM, B2. Cambridge University Press.

Cita Chicago (17th ed.)

Metcalf, Rob, Chris Cavey, i Alison Greenwood. English Unlimited: Upper Intermediate. Self-study Pack, Workbook with DVD-ROM, B2. Cambridge: Cambridge University Press, 2011.

Cita MLA (9th ed.)

Metcalf, Rob, et al. English Unlimited: Upper Intermediate. Self-study Pack, Workbook with DVD-ROM, B2. Cambridge University Press, 2011.