Metcalf, R., Cavey, C., & Greenwood, A. (2011). English unlimited: Upper intermediate. Self-study pack, Workbook with DVD-ROM, B2. Cambridge University Press.
Citazione stile Chigago Style (17a edizione)Metcalf, Rob, Chris Cavey, e Alison Greenwood. English Unlimited: Upper Intermediate. Self-study Pack, Workbook with DVD-ROM, B2. Cambridge: Cambridge University Press, 2011.
Citatione MLA (9a ed.)Metcalf, Rob, et al. English Unlimited: Upper Intermediate. Self-study Pack, Workbook with DVD-ROM, B2. Cambridge University Press, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.