Viswanathan, T. (1992). Telecommunication switching systems and networks. Prentice Hall of India Private Ltd..
Lua i Stíl Chicago (17ú heag.)Viswanathan, Thiagarajan. Telecommunication Switching Systems and Networks. New Delhi: Prentice Hall of India Private Ltd., 1992.
Lua MLA (8ú heag.)Viswanathan, Thiagarajan. Telecommunication Switching Systems and Networks. Prentice Hall of India Private Ltd., 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.