1. ApSimon, H., D. Pearce, and E. Özdemiroğlu. 1997. Acid Rain in Europe: Counting the Cost. New York: Earthscan.
2. BBC. 2012. Durham Cathedral’s Visitors Average 32p Instead of £5. Accessed August 22, 2016. http://www.bbc.com/news/uk-england-tyne-17465535.
3. Berend, I. 2014. A Restructured Economy: From the Oil Crisis to the Financial Crisis, 1973-2009. In The Oxford Handbook of Postwar European History, ed. D. Stone, 406–442. Oxford: Oxford University Press.
4. Cameron, C., and M. Rössler. 2013. Many Voices, One Vision: The Early Years of the World Heritage Convention. Farnham: Ashgate.
5. Church of England. 2013. Financial Overview 2004-13. Accessed August 22, 2016. https://www.churchofengland.org/media/1886486/financialoverview.pdf.