ASHLEY A. (1984). HANDBOOK OF COMMERCIAL CORRESPONDENCE. OXFORD UNIVERSITY PRESS.
Lua i Stíl Chicago (17ú heag.)ASHLEY A. HANDBOOK OF COMMERCIAL CORRESPONDENCE. NEW DELHI BOMBAY: OXFORD UNIVERSITY PRESS, 1984.
Lua MLA (9ú heag.)ASHLEY A. HANDBOOK OF COMMERCIAL CORRESPONDENCE. OXFORD UNIVERSITY PRESS, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.