National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, National Research Council (U.S.). Highway Research Board, & National Academy of Engineering. Summary of progress - National Cooperative Highway Research Program. Highway Research Board, National Research Council, National Academy of Sciences - National Academy of Engineering.
芝加哥风格引文National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, National Research Council (U.S.). Highway Research Board, 与 National Academy of Engineering. Summary of Progress - National Cooperative Highway Research Program. [Washington]: Highway Research Board, National Research Council, National Academy of Sciences - National Academy of Engineering.
MLA引文National Cooperative Highway Research Program, et al. Summary of Progress - National Cooperative Highway Research Program. Highway Research Board, National Research Council, National Academy of Sciences - National Academy of Engineering.