United States. Federal Highway Administration. (1968). A handbook of highway safety design and operating practices. For sale by the Supt. of Docs., U.S. Govt. Print. Off..
芝加哥风格引文United States. Federal Highway Administration. A Handbook of Highway Safety Design and Operating Practices. Washington,: For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1968.
MLA引文United States. Federal Highway Administration. A Handbook of Highway Safety Design and Operating Practices. For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1968.
警告：这些引文格式不一定是100％准确.