Gairns, R., & Redman, S. (2006). Natural English: Elementary student's book. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Gairns, Ruth, agus Stuart Redman. Natural English: Elementary Student's Book. Oxford: Oxford University Press, 2006.
Lua MLA (8ú heag.)Gairns, Ruth, agus Stuart Redman. Natural English: Elementary Student's Book. Oxford University Press, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.