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.
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