Khanna D.R, Bedi R.S, . (1992). A Text Book Of Sound. Delhi: Atmmaram & Sons.
Khanna D.R, Bedi R.S, . 1992. A Text Book Of Sound. Delhi: Atmmaram & Sons.
Khanna D.R, Bedi R.S, . A Text Book Of Sound. Delhi: Atmmaram & Sons. 1992.
