Ungar, A. (1967). Traffic attraction of rural outdoor recreational areas. Highway Research Board, Division of Engineering, National Research Council, National Academy of Sciences--National Academy of Engineering.
芝加哥风格引文Ungar, Andrew. Traffic Attraction of Rural Outdoor Recreational Areas. [Washington]: Highway Research Board, Division of Engineering, National Research Council, National Academy of Sciences--National Academy of Engineering, 1967.
MLA引文Ungar, Andrew. Traffic Attraction of Rural Outdoor Recreational Areas. Highway Research Board, Division of Engineering, National Research Council, National Academy of Sciences--National Academy of Engineering, 1967.
警告：这些引文格式不一定是100％准确.