Boteler, Jennifer (May–June 2011). "Masters of Information". Public Roads. 74 (6). Washington, D.C.: U.S. Federal Highway Administration: 28–33. OCLC733951671. Retrieved Aug 9, 2012.
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Boteler, Jennifer (May–June 2011). "Masters of Information". Public Roads. 74 (6). Washington, D.C.: U.S. Federal Highway Administration: 28–33. OCLC733951671. Retrieved Aug 9, 2012.