Dellar, H., & Walkley, A. (2007). Course book Innovations: A course in natural english. Thomson.
Lua i Stíl Chicago (17ú heag.)Dellar, Hugh, agus Andrew Walkley. Course Book Innovations: A Course in Natural English. United Kingdom: Thomson, 2007.
Lua MLA (9ú heag.)Dellar, Hugh, agus Andrew Walkley. Course Book Innovations: A Course in Natural English. Thomson, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.