Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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