APA (7th ed.) Zitazioa

Leech, G. (1973). A communicative grammar of English. Longman.

Chicago Style (17th ed.) Zitazioa

Leech, Geoffrey. A Communicative Grammar of English. London: Longman, 1973.

MLA (9th ed.) Zitazioa

Leech, Geoffrey. A Communicative Grammar of English. Longman, 1973.