APA

United States, . (1973). A handbook of highway safety design and operating practices. Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.

Chicago

United States, . 1973. A handbook of highway safety design and operating practices. Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.

Harvard

United States, . (1973). A handbook of highway safety design and operating practices. Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.

MLA

United States, . A handbook of highway safety design and operating practices. Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off. 1973.