1. Association of American Geographers (n.d.). Regions and regionalization, why do people make regions, Erie Canal and Pennsylvania response. ARGUS: Activities and Readings in the Geography of the United States.
2. Railroads;Bellingham Centennial Celebration,2012
3. Daddy, could you tell me what a truck driver was?;Berman;Wall Street Journal,2013
4. Commercial structure and commercial blight: Retail patterns and processes in the city of Chicago;Berry,1963
5. Disruptions: how driverless cars could reshape cities;Bilton;New York Times,2013