Cita APA (7th ed.)
Murphy, R. (1998). Essential english grammar: A self-study reference and practice book for elementary students of english; with answers (2nd ed.). CUP.
Cita Chicago (17th ed.)
Murphy, Raymond. Essential English Grammar: A Self-study Reference and Practice Book for Elementary Students of English; with Answers. 2nd ed. Cambridge: CUP, 1998.
Cita MLA (9th ed.)
Murphy, Raymond. Essential English Grammar: A Self-study Reference and Practice Book for Elementary Students of English; with Answers. 2nd ed. CUP, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.