Subrahmanyam, N., & Lal, B. (1995). A textbook of sound: [for B.Sc.(Pass Honours and Subsidiary),Engineering sutdunts of Indian University and IAS Examination] (2nd rev.ed.). G. Bell and sons Ltd. ; Vikas Publishing House.

Subrahmanyam, N., and Brij Lal. A Textbook of Sound: [for B.Sc.(Pass Honours and Subsidiary),Engineering Sutdunts of Indian University and IAS Examination]. 2nd rev.ed. London : New Delhi: G. Bell and sons Ltd. ; Vikas Publishing House, 1995.

Subrahmanyam, N., and Brij Lal. A Textbook of Sound: [for B.Sc.(Pass Honours and Subsidiary),Engineering Sutdunts of Indian University and IAS Examination]. 2nd rev.ed. G. Bell and sons Ltd. ; Vikas Publishing House, 1995.