1. Archaeological perspectives of early Indian societies;Ratnagar,1995
2. The first millennium B.C. in northern India (up to the end of Mauryan period);Thapar,1995
3. A biological comparison of eight endogamous groups of the same rank;Karve;Curr. Anthropol.,1968
4. History and Geography of Human Genes;Cavalli-Sforza,1994
5. India's communities;Singh;People of India,1998