Cita APA (7th ed.)

Murphy, R., & Pallini, L. (1997). Essential grammar in use (2a. ed.). Cambridge University.

Cita Chicago (17th ed.)

Murphy, Raymond, i Lelio Pallini. Essential Grammar in Use. 2a. ed. Nueva York: Cambridge University, 1997.

Cita MLA (9th ed.)

Murphy, Raymond, i Lelio Pallini. Essential Grammar in Use. 2a. ed. Cambridge University, 1997.