Works Cited

Whitaker, Alex. “Derinkuyu, Turkey.” Derinkuyu, Turkey. N.p., n.d. Web. 14 Dec. 2016. <http://www.ancient-wisdom.com/turkeyderinkuyu.htm>.

“The Intriguing Ancient Underground City of Derinkuyu.” Today I Found Out. N.p., 2013. Web. 14 Dec. 2016. <http://www.todayifoundout.com/index.php/2013/09/intriguing-ancient-underground-city-derinkuyu/>.

“Derinkuyu & The Underground Cities of Cappadocia” 9 May 2014                                             http://sometimes-interesting.com/2014/05/09/derinkuyu-the-underground-cities-of-cappadocia/

No author. “Tunnel Inventory on Grand Canary Island (Spain), geology and associated geotechnical problems.” Volcanic Rock Mechanics: Rock Mechanics and Geo-engineering in Volcanic Environments. Olalla, Claudia, et al. (eds), CRC Press, 2010, pg 255-264. https://books.google.com/books?id=tC_MBQAAQBAJ&pg=PA261&lpg=PA261&dq=excavation+on+volcanic+rock&source=bl&ots=_SjNlCtTMb&sig=kSqRq_ttxtIr-3Sqhta3r5PR6xQ&hl=en&sa=X&ved=0ahUKEwiG-dWPyM_QAhVLySYKHWLgDYYQ6AEINTAH#v=onepage&q=excavation%20on%20volcanic%20rock&f=false

Pinkowski, Jennifer. “Massive Underground City Found in Capadocia Region of Turkey.” N.p., 26 March 2015.  Web. 14 Dec. 2016 http://news.nationalgeographic.com/2015/03/150325-underground-city-cappadocia-turkey-archaeology/