Singh R. P. Professional communication. Oxford University press.
Lua i Stíl Chicago (17ú heag.)Singh R. P. Professional Communication. New Delhi New Delhi: Oxford University press.
Lua MLA (9ú heag.)Singh R. P. Professional Communication. Oxford University press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.