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.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNational 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, এবং T. J. McGrath. Recommended Specifications for Large-span Culverts. Washington, D.C: National Academy Press, 2002.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিNational Research Council (U.S.). Transportation Research Board, et al. Recommended Specifications for Large-span Culverts. National Academy Press, 2002.