HRB-AASHO Joint Committee on Maintenance and Operations Personnel & National Research Council (U.S.). Highway Research Board. Progress report of HRB-AASHO Joint Committee on Maintenance and Operations Personnel. Highway Research Board.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)HRB-AASHO Joint Committee on Maintenance and Operations Personnel و National Research Council (U.S.). Highway Research Board. Progress Report of HRB-AASHO Joint Committee on Maintenance and Operations Personnel. Washington, D.C: Highway Research Board.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)HRB-AASHO Joint Committee on Maintenance and Operations Personnel و National Research Council (U.S.). Highway Research Board. Progress Report of HRB-AASHO Joint Committee on Maintenance and Operations Personnel. Highway Research Board.