Allen, M., Powell, D., & Dolby, D. (2007). IELTS graduation: Student's book. Macmillan.
Lua i Stíl Chicago (17ú heag.)Allen, Mark, Debra Powell, agus Dickie Dolby. IELTS Graduation: Student's Book. Oxford: Macmillan, 2007.
Lua MLA (8ú heag.)Allen, Mark, et al. IELTS Graduation: Student's Book. Macmillan, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.