Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.