(1978). Official route numbering for the national system of interstate and defense highways: As adopted by the American Association of State Highway and Transportation Officials, June 29, 1978. [The Association].
Chicago Style (17th ed.) CitationOfficial Route Numbering for the National System of Interstate and Defense Highways: As Adopted by the American Association of State Highway and Transportation Officials, June 29, 1978. [Washington, D.C.?]: [The Association], 1978.
MLA (9th ed.) CitationOfficial Route Numbering for the National System of Interstate and Defense Highways: As Adopted by the American Association of State Highway and Transportation Officials, June 29, 1978. [The Association], 1978.
Warning: These citations may not always be 100% accurate.