National Research Council (U.S.). Highway Research Board. (1971). Highway and urban transportation in the 1970's and 1980's: A panel discussion at the plenary session of the 50th Annual Meeting of the Highway Research Board, January 19, 1971.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Research Council (U.S.). Highway Research Board. Highway and Urban Transportation in the 1970's and 1980's: A Panel Discussion at the Plenary Session of the 50th Annual Meeting of the Highway Research Board, January 19, 1971. Washington, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)National Research Council (U.S.). Highway Research Board. Highway and Urban Transportation in the 1970's and 1980's: A Panel Discussion at the Plenary Session of the 50th Annual Meeting of the Highway Research Board, January 19, 1971. 1971.