1. Atula. (2011). Western Tragopan. 2013, from http://indiasendangered.com/western-tragopanspotted-in-new-ranges-in-kashmir/
2. Model-based strategic planning for the development of community based tourism: A case study of Ayodhya Hills in West Bengal, India.;S.Banik;GeoJournal,2020
3. Berg, B. L. (2007). Qualitative Research Methods for the Social Sciences (R. Sherman Ed. Sixth Edition ed.). Boston: Pearson Education, Inc.
4. Bhattacharya, P., & Kumari, S. (2004, August). Application of criteria and indicator for sustainable ecotourism: Scenario under Globalization. In Abstract and Paper Submitted for the IASCP Bi-Annual Conference on “The Commons in an Age of Global Transition: Challenges, Risk and Opportunities” at Oaxaca, Mexico from (pp. 9-14).
5. Billing valley. (n.d.-a). Hiking. 2013, from http://www.billingvalley.com/gallery.php