Gaya APA

P, S., Sapre, S, D. (2007). Communication systems : analog & digital/R P Singh (2nd.Ed). New Delhi: Tata McGraw-Hill.

Gaya MLA

P, Singh,R., Sapre, S, D. "Communication systems : analog & digital/R P Singh". 2nd.Ed New Delhi: Tata McGraw-Hill, 2007. Text.