Cita APA (7th ed.)

Murphy, R. (2003). Essential English grammar: A self-study reference and practice book for elementary students of english (2nd ed.). Cambridge Univ. Pr.

Cita Chicago (17th ed.)

Murphy, Raymond. Essential English Grammar: A Self-study Reference and Practice Book for Elementary Students of English. 2nd ed. Cambridge: Cambridge Univ. Pr, 2003.

Cita MLA (9th ed.)

Murphy, Raymond. Essential English Grammar: A Self-study Reference and Practice Book for Elementary Students of English. 2nd ed. Cambridge Univ. Pr, 2003.