Metcalf, R., Cavey, C., & Greenwood, A. (2011). English unlimited: Upper intermediate. Self-study pack, Workbook with DVD-ROM, B2. Cambridge University Press.
Chicago-viite (17. p.)Metcalf, Rob, Chris Cavey, ja Alison Greenwood. English Unlimited: Upper Intermediate. Self-study Pack, Workbook with DVD-ROM, B2. Cambridge: Cambridge University Press, 2011.
MLA-viite (9. p.)Metcalf, Rob, et al. English Unlimited: Upper Intermediate. Self-study Pack, Workbook with DVD-ROM, B2. Cambridge University Press, 2011.
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