Cita APA (7a ed.)

Murphy, R. (1994). Essential grammar in use (1a. ed.). Cambridge university press.

Cita Chicago Style (17a ed.)

Murphy, Raymond. Essential Grammar in Use. 1a. ed. Madrid: Cambridge university press, 1994.

Cita MLA (9a ed.)

Murphy, Raymond. Essential Grammar in Use. 1a. ed. Cambridge university press, 1994.