Trask,R.L. (2001). Penguin Guide To Common Errors In English (NA.). Penguin Books.
Lua i Stíl Chicago (17ú heag.)Trask,R.L. Penguin Guide To Common Errors In English. NA. New Delhi: Penguin Books, 2001.
Lua MLA (9ú heag.)Trask,R.L. Penguin Guide To Common Errors In English. NA. Penguin Books, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.