Punmia B. C, Jain Arun Kumar & Jain Ashok K.Surveying vol. 2. New Delhi: .
Punmia B. C, Jain Arun Kumar and Jain Ashok K.Surveying vol. 2. New Delhi: .
Punmia B. C, Jain Arun Kumar and Jain Ashok K.New Delhi: . .
