Hewings, M. (2019). Advanced English Grammar (1st.). Cambridge.
Lua i Stíl Chicago (17ú heag.)Hewings, Martin. Advanced English Grammar. 1st. New Delhi: Cambridge, 2019.
Lua MLA (9ú heag.)Hewings, Martin. Advanced English Grammar. 1st. Cambridge, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.