1.	Himadri Phukan, Z. Rahman, and P. Devdutt, “Emergence of Spirituality of tourism in India” IJMT, Volume 2, Issue 4, Issn: 2249-1058, April 2012.
2.	Ben Bowler(2013) in his blog How Spritiual tourism might change the world.
3.	Tribe, J.(2008), The art of Tourism, Annals of Tourism Research, 35(4), 924-944.
4.	Sin, H.L. (2009), Volunteer tourism- “involve Me and I will learn”, Annals of Tourism Research, 36 (3), 480-501.
5.	Dr. Vinay Sharma, Dr. Rajat Aggarwal, Mr. Pramod Chandra,  “Religious to Spritual Tourism Transformation Journey of Uttarakhand- Hill State in India,” Proceedings of the International Conferance on Tourism, Hospitality and Marketing, ISBN-978-1-943579-19-8, Ebene- Mauritius, 21-23 January, 2016. Paper ID: MC612.”
6.	Uttarakhand Tourisam Development Board. 
7.	GmvLtd Yatra Office Rishikesh, Uttarakhand
8.	http://uttarakhandtourism.gov.in
9.	https://en.wikipedia.org/wiki/religious_tourism