Shaw, K. (1990). Collins Cobuild English grammar exercises. Collins.
Lua i Stíl Chicago (17ú heag.)Shaw, Katy. Collins Cobuild English Grammar Exercises. London: Collins, 1990.
Lua MLA (9ú heag.)Shaw, Katy. Collins Cobuild English Grammar Exercises. Collins, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.