how aobut this:

 The Muslim community of the Indo-Pakistan subcontinent, 610-1947; a brief historical analysis. by Ishtiaq Husain Qureshi

 History of the Jats. by Ram Sarup Joon

 Sindhi culture by Upendra Thakur

 An advanced history of India. by Ramesh Chandra Majumdar;  Hemchandra Raychaudhuri;  Kalikinkar Datta

All the books I cited can be found in a good library.