Rai, U. (1981). Business communication. Himalaya.
Lua i Stíl Chicago (17ú heag.)Rai, U. Business Communication. Bombay: Himalaya, 1981.
Lua MLA (9ú heag.)Rai, U. Business Communication. Himalaya, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.