Madhukar R K. (2007). Business Communication. Vikas Publishing.
Lua i Stíl Chicago (17ú heag.)Madhukar R K. Business Communication. Noida: Vikas Publishing, 2007.
Lua MLA (9ú heag.)Madhukar R K. Business Communication. Vikas Publishing, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.