1. Managing Coastal Resources in the 21st Century;Weinstein;Frontiers in Ecology and the Environment,2007
2. American Association of Port Authorities 2008 http://www.aapa-ports.org/home.cfm
3. American Association of Port Authorities, New Study Details Economic Benefits of U.S. Seaports 2008 American Association of Port Authorities
4. Federal Highway Administration 2008 http://www.fhwa.dot.gov/