Region: North-West India

  1. India under the Kushanas by B. N. Puri
  2. The Rise and Fall of the Kushana Empire by B. N. Mukherjee
  3. The Early Kushanas by Baldev Kumar
  4. Disintegration of the Kushana Empire by B. N. Mukherjee
  5. Society, religion and art of the Kushana India by Kanchan Chakraberti
  6. Economic Factors in Kushana History by B. N. Mukherjee

There are a lot of books which discuss The Kushanas. The above ones will help give a good idea.