Wren, W., & Lindsay, S. (2019). Cambridge Grammar And Writing Skills Learner's Book 6 (1st.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Wren, Wendy, agus Sarah Lindsay. Cambridge Grammar And Writing Skills Learner's Book 6. 1st. UK: Cambridge University Press, 2019.
Lua MLA (9ú heag.)Wren, Wendy, agus Sarah Lindsay. Cambridge Grammar And Writing Skills Learner's Book 6. 1st. Cambridge University Press, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.