Doff, A., Lloyd, M., Thake, R., & Brabben, C. (2010). English unlimited: Elementary Teacher's Pack. A2. Cambridge University Press.
Citazione stile Chigago Style (17a edizione)Doff, Adrian, Mark Lloyd, Rachel Thake, e Cathy Brabben. English Unlimited: Elementary Teacher's Pack. A2. Cambridge University Press, 2010.
Citatione MLA (9a ed.)Doff, Adrian, et al. English Unlimited: Elementary Teacher's Pack. A2. Cambridge University Press, 2010.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.