Cita APA (7th ed.)
Naylor, H., & Murphy, R. (1996). Essential english grammar: Supplementary exercises; with answers. CUP.
Cita Chicago (17th ed.)
Naylor, Helen, i Raymond Murphy. Essential English Grammar: Supplementary Exercises; with Answers. Cambridge: CUP, 1996.
Cita MLA (9th ed.)
Naylor, Helen, i Raymond Murphy. Essential English Grammar: Supplementary Exercises; with Answers. CUP, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.