Cita APA (7th ed.)

Tilbury, A., Hendra, L. A., & Ackroyd, S. (2011). English unlimited: Upper Intermediate Teacher's Pack. B2 (1a. ed.). Cambridge University Press.

Cita Chicago (17th ed.)

Tilbury, Alex, Leslie Anne Hendra, i Sarah Ackroyd. English Unlimited: Upper Intermediate Teacher's Pack. B2. 1a. ed. Cambridge University Press, 2011.

Cita MLA (9th ed.)

Tilbury, Alex, et al. English Unlimited: Upper Intermediate Teacher's Pack. B2. 1a. ed. Cambridge University Press, 2011.