1. http://www.english-heritage.org.uk/visit/places/stonehenge/history/Accessed Feb 11, 2018.
2. One thousand roads to Mecca: ten centuries of travelers writing about the Muslim pilgrimage paperback,1998
3. https://www.poetryfoundation.org/poems-and-poets/poems/detail/44299 Accessed Dec 23 2017.
4. The Myth of the Madding Crowd (Social Institutions and Social Change) by Clark McPhail (Author). https://www.amazon.com/Madding-Crowd-Social-Institutions-Change/dp/0202303756.
5. The psychology of health and wellbeing in mass gatherings: a review and a research agenda;Hopkins;J Epidemiol Glob Health,2016