Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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