1. Tourism distribution channels: Knowledge requirements. In N. Scott, M. De Martino, & M. Van Niekerk (Eds.). Knowledge transfer to and within tourism: Academic, industry and government bridges (pp. 289–301);Colombo,2017
2. Statistics and Facts about Online Shopping, Statista, June 2014. https://www.statista.com/topics/2477/online-shopping-behavior/. 14.05.2019
3. P. H. Lewis, (1994). “Attention Shoppers: Internet is Open.” Editorial. The New York Times, August 12, 1994.
4. http://www.tuik.gov.tr
5. N. Gandal, H. Halaburda (2014) “Competition in the Cryptocurrency Market”. Bank of Canada working paper, 2014-33. http://www.econstor.eu/bitstream/10419/103022/1/791932281.pdf