Cita APA (7th ed.)

Leech, G. (2002). A Communicative grammar of english (3rd ed.). Pearson.

Cita Chicago (17th ed.)

Leech, Geoffrey. A Communicative Grammar of English. 3rd ed. Delhi: Pearson, 2002.

Cita MLA (9th ed.)

Leech, Geoffrey. A Communicative Grammar of English. 3rd ed. Pearson, 2002.