Frailey L.E & Mamchak Susan. (1993). Hanbook of Business Letters (3rd Edition.). Super Book House.
Lua i Stíl Chicago (17ú heag.)Frailey L.E agus Mamchak Susan. Hanbook of Business Letters. 3rd Edition. Bombay: Super Book House, 1993.
Lua MLA (9ú heag.)Frailey L.E agus Mamchak Susan. Hanbook of Business Letters. 3rd Edition. Super Book House, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.