Citazione Stile APA (7a Edizione)

Doff, A., Thaine, C., Stranks, J., Lewis-Jones, P., Godfrey, R., & Puchta, H. (2016). Empower A1: Starter student's book (1a. ed.). Cambridge University.

Citazione stile Chigago Style (17a edizione)

Doff, Adrian, Craig Thaine, Jeff Stranks, Peter Lewis-Jones, Rachel Godfrey, e Herbert Puchta. Empower A1: Starter Student's Book. 1a. ed. Cambridge: Cambridge University, 2016.

Citatione MLA (9a ed.)

Doff, Adrian, et al. Empower A1: Starter Student's Book. 1a. ed. Cambridge University, 2016.