Swan, M., & Walter, C. (2011). Oxford english grammar course: Intermediate. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Swan, Michael, agus Catherine Walter. Oxford English Grammar Course: Intermediate. New York: Oxford University Press, 2011.
Lua MLA (9ú heag.)Swan, Michael, agus Catherine Walter. Oxford English Grammar Course: Intermediate. Oxford University Press, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.