APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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