Cita APA (7th ed.)

Doff, A., Smith, H., Thake, R., Brabben, C., & Lloyd, M. (2010). English unlimited: Pre-intermediate Teacher's Pack. B1. Cambridge University Press.

Cita Chicago (17th ed.)

Doff, Adrian, Howard Smith, Rachel Thake, Cathy Brabben, i Mark Lloyd. English Unlimited: Pre-intermediate Teacher's Pack. B1. Cambridge University Press, 2010.

Cita MLA (9th ed.)

Doff, Adrian, et al. English Unlimited: Pre-intermediate Teacher's Pack. B1. Cambridge University Press, 2010.