Cita APA (7th ed.)

MURPHY, R. (1990). Essential grammar in use: A self-study reference andpractice book for elementary students of english. Cambridge University Press.

Cita Chicago (17th ed.)

MURPHY, Raymond. Essential Grammar in Use: A Self-study Reference Andpractice Book for Elementary Students of English. Cambridge: Cambridge University Press, 1990.

Cita MLA (9th ed.)

MURPHY, Raymond. Essential Grammar in Use: A Self-study Reference Andpractice Book for Elementary Students of English. Cambridge University Press, 1990.