Close, R. (1971). The New english grammer. Allen & Unwin Publ.
Lua i Stíl Chicago (17ú heag.)Close, R. The New English Grammer. London: Allen & Unwin Publ, 1971.
Lua MLA (9ú heag.)Close, R. The New English Grammer. Allen & Unwin Publ, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.