Venugopal Reddy, V., & Manjulika, S. (2000). The World of open and distance learning. Viva Books.
Lua i Stíl Chicago (17ú heag.)Venugopal Reddy, V., agus S. Manjulika. The World of Open and Distance Learning. New Delhi: Viva Books, 2000.
Lua MLA (8ú heag.)Venugopal Reddy, V., agus S. Manjulika. The World of Open and Distance Learning. Viva Books, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.