Cita APA

Doff, A., & Adrian Doff; Johanna Stirling; Sarah Ackroyd. (2011). English unlimited: C1, Advanced teachers pack. Cambridge: Cambridge University Press.

Citación estilo Chicago

Doff, Adrian, y Adrian Doff; Johanna Stirling; Sarah Ackroyd. English Unlimited: C1, Advanced Teachers Pack. Cambridge: Cambridge University Press, 2011.

Cita MLA

Doff, Adrian, y Adrian Doff; Johanna Stirling; Sarah Ackroyd. English Unlimited: C1, Advanced Teachers Pack. Cambridge: Cambridge University Press, 2011.