Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). ISSN 0033-3735. สืบค้นเมื่อ March 16, 2012.
Office of Highway Policy Information (October 21, 2014). Table HM-20: Public Road Length, 2013, Miles By Functional System (รายงาน). Federal Highway Administration. http://www.fhwa.dot.gov/policyinformation/statistics/2013/hm20.cfm. เรียกข้อมูลเมื่อ April 3, 2015.
สิงหาคม 16, 2021
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