Cita APA (7a ed.)

Geoffrey Leech, J. S. (2002). <A >comunicative grammar of english. Pearson Education.

Cita Chicago Style (17a ed.)

Geoffrey Leech, Jan Svartvik. <A >comunicative Grammar of English. Pearson Education, 2002.

Cita MLA (8a ed.)

Geoffrey Leech, Jan Svartvik. <A >comunicative Grammar of English. Pearson Education, 2002.