Prof. Simmi Agnihotri, and Dr. Vijay Singh. “VOLUNTARY TRIBAL MIGRANTS AND THEIR ROLE IN ORIGIN PLACE: A STUDY OF THE PANGWALA TRIBE OF HIMACHAL PRADESH (INDIA)”. International Engineering Journal For Research & Development, vol. 5, no. ICIPPS, June 2020, p. 10, doi:10.17605/OSF.IO/MXTUH .