Cita APA (7th ed.)

Leech, G. N., & Svartvik, J. (1987). A communicative grammar of english. Longman.

Cita Chicago (17th ed.)

Leech, Geoffrey N., i Jan Svartvik. A Communicative Grammar of English. Londres: Longman, 1987.

Cita MLA (9th ed.)

Leech, Geoffrey N., i Jan Svartvik. A Communicative Grammar of English. Longman, 1987.