1. WEF. (2015). Expanding participation and boosting growth: The infrastructure needs of the digital economy. Accessed December 26, 2019, from www3.weforum.org/docs/WEFUSA_DigitalInfrastructure_Report2015.pdf
2. OECD. (2015). OECD digital economy outlook 2015. Accessed December 26, 2019, from http://www.oecd.org/sti/oecd-digital-economy-outlook-2015-9789264232440-en.htm
3. EC. (2013). Expert group on taxation of the digital economy: European Commission. Accessed December 26, 2019, from http://ec.europa.eu/taxation_customs/sites/taxation/files/resources/documents/taxation/gen_info/good_governance_matters/digital/general_issues.pdf
4. Tapscott, D. (1996). The digital economy: Promise and peril in the age of networked intelligence. New York, NY: McGraw-Hill.
5. Lane, N. (1999). Advancing the digital economy into the 21st century. Information Systems Frontiers, 1(3), 317–320.