National Research Council (U.S.). Transportation Research Board, American Association of State Highway and Transportation Officials, United States. Federal Highway Administration, National Cooperative Highway Research Program, & McGrath, T. J. (2002). Recommended specifications for large-span culverts. National Academy Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Research Council (U.S.). Transportation Research Board, American Association of State Highway and Transportation Officials, United States. Federal Highway Administration, National Cooperative Highway Research Program, و T. J. McGrath. Recommended Specifications for Large-span Culverts. Washington, D.C: National Academy Press, 2002.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Research Council (U.S.). Transportation Research Board, et al. Recommended Specifications for Large-span Culverts. National Academy Press, 2002.