Naylor, H., & Murphy, R. (2007). Essential Grammar in use suplementary exercises, with answers (2a. ed.). Cambridge University Press.
Citazione stile Chigago Style (17a edizione)Naylor, Helen, e Raymond Murphy. Essential Grammar in Use Suplementary Exercises, with Answers. 2a. ed. Cambridge University Press, 2007.
Citatione MLA (9a ed.)Naylor, Helen, e Raymond Murphy. Essential Grammar in Use Suplementary Exercises, with Answers. 2a. ed. Cambridge University Press, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.