Greetings!

The books you can refer to:

• Ray Chaudhary, H.C.: Political History of Ancient India, Calcutta, 1963.
• Majumdar, Ray: An Advanced History of India.
  Chaudhary & Datta :
• Tripathi, R.S.: Ancient India.
• Sastri. K.A.N: The age of the Nandas and Mauryans (In English and Hindi)
• Basham, A: The Wonder That was India, London 1954
• Upendra Baxi: Environmental Protection Act : An Agenda for Implemention.
• Dr. I.A. Khan: Environmental Law.
• Rajaraman, V.: Fundamentals of Computers (3rd ed.), Prentice Hall of India, New Delhi.
• S.K. Shukla : Compendrum on Environmental Pollutions Laws,1985.
• Sanders, D. H.: Computers Today, Me Gra w Hill, 1988.
• Chhangani, M.S.: Computer: Insight and Applications, Alka Publications, Ajmer
• Sharma, M.P.: Public Administration Theory and Practice
• Trainer, T.et.al: Computer (4th ed.) Me Graw Hill, 1994.
• Willoughby: Principles of Public Administration
• White: Introduction to the study of Public Administration

Hope this helps!