SWAN , M. (1982). PRACTICAL ENGLISH USAGE. OXFORD UNI. PRESS.
Lua i Stíl Chicago (17ú heag.)SWAN , MICHAEL. PRACTICAL ENGLISH USAGE. BOMBAY: OXFORD UNI. PRESS, 1982.
Lua MLA (9ú heag.)SWAN , MICHAEL. PRACTICAL ENGLISH USAGE. OXFORD UNI. PRESS, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.