Cita APA (7th ed.)

Murphy, R. (1997). Essential grammar in use: A self-study reference and practice book for elementary students of english, with answers (2a. ed.). Cambridge University Press.

Cita Chicago (17th ed.)

Murphy, Raymond. Essential Grammar in Use: A Self-study Reference and Practice Book for Elementary Students of English, with Answers. 2a. ed. Nueva York: Cambridge University Press, 1997.

Cita MLA (9th ed.)

Murphy, Raymond. Essential Grammar in Use: A Self-study Reference and Practice Book for Elementary Students of English, with Answers. 2a. ed. Cambridge University Press, 1997.