Citazione Stile APA (7a Edizione)
Duckworth, M., Peel, E., & Aspinall, P. (1992). Success at First Certificate: Practice Tests 2 with key (5.impression.). The University Press.
Citazione stile Chigago Style (17a edizione)
Duckworth, Michael, E. Peel, e P. Aspinall. Success at First Certificate: Practice Tests 2 with Key. 5.impression. Oxford: The University Press, 1992.
Citatione MLA (9a ed.)
Duckworth, Michael, et al. Success at First Certificate: Practice Tests 2 with Key. 5.impression. The University Press, 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.