Author: S. Gopal
Publisher:Jawaharlal Nehru Memorial Fund, New Delhi
Copyright:1985
Author: S. Gopal
Publisher:Orient Longman, New Delhi
Copyright:1982
Author: S. Gopal Kumar, Ravinder Prasad, H.Y. Sharada
Publisher:Jawaharlal Nehru Memorial Fund, New Delhi
Copyright:1998
Author: Kumar, Ravinder Prasad, H.Y. Sharada S. Gopal
Publisher:Jawaharlal Nehru Memorial Fund, New Delhi
Copyright:1998
Author: Kumar, Ravinder Panigrahi, D.N.
Publisher:Vikas Publishing House, New Delhi
Copyright:1982
Author: Kumar, Ravinder Sharma, Hari Dev
Publisher:Vikas Publishing House, New Delhi
Copyright:1998