1. Mohan Krishen Khanna , Chapter Eight Ecotourism in India.
2. Fennel and Eagles 1990, the conceptual framework of ecotourism.
3. Ecotourism and Development book by Romila Chawla.
4. Om Parkash, Chapter 7, Ecotourism in India.
5. Journal of Ecotourism 2005, 2004, 2003, 2002, Vol.4 No. 2.
6. Professor Nawab Ali khan, Development of ecotourism resources in India.