1. American Anthropological Association, Statement on Race. 1998. Available at http://www.americananthro.org/ConnectWithAAA/Content.aspx .
2. Anderson, Monica, and Andrew Perrin. 2015. 15% of Americans don’t use the internet. Who are they? Pew Research Center, July 28. Available at http://www.pewresearch.org/fact-tank/2015/07/28/15-of-americans-dont-use-the-internet-who-are-they/ .
3. Belinfante, Alexander. 1993. Telephone subscribership in the United States. Washington, DC: Federal Communications Commission.
4. Brooks, John. 1975. Telephone: The first hundred years. New York: Harper & Row.
5. Affordability of Telephone Service 1: Non-customer survey;Chesapeake and Potomac Telephone Company,1993