APA استشهاد

Geoffrey Leech & Jan Svartvik. (2009). A communicative grammar of English (5th.). Pearson Education.

استشهاد بنمط شيكاغو

Geoffrey Leech و Jan Svartvik. A Communicative Grammar of English. 5th. New Delhi: Pearson Education, 2009.

MLA استشهاد

Geoffrey Leech و Jan Svartvik. A Communicative Grammar of English. 5th. Pearson Education, 2009.