1. Census of India (2011a) Himachal Pradesh, Paper 1 of 2011, provisional population total. Census of India, India.
2. Census of India (2011b) Himachal Pradesh, Paper 2 of 2011, provisional population total. Census of India, India.
3. Census of India (2011c) Census handbook of Himachal Pradesh, Government of India.
4. Conservation International (CI) (2005) Biodiversity Hotspots. Available online at http://www.biodiversityhotspots.org/XP/ hotspots/Himalaya.
5. Nayar M. P., (1977) Changing patterns of the Indian flora. Bulletin Botanical Survey of India 19: 145–154.