Bowman, J. (1979). Effective business correspondence. Confield Press.
Lua i Stíl Chicago (17ú heag.)Bowman, J. Effective Business Correspondence. Sun Francisco: Confield Press, 1979.
Lua MLA (9ú heag.)Bowman, J. Effective Business Correspondence. Confield Press, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.