United States. Federal Highway Administration\nUnited States. Bureau of Public Roads\nUnited States. Federal Highway Administration. Offices of Research, Development, and Technology\nUnited States. Federal Highway Administration. Office of Research and Development. (1918). Public Roads: A journal of highway research. U.S. Federal Highway Administration.
Lua i Stíl Chicago (17ú heag.)United States. Federal Highway Administration\nUnited States. Bureau of Public Roads\nUnited States. Federal Highway Administration. Offices of Research, Development, and Technology\nUnited States. Federal Highway Administration. Office of Research and Development. Public Roads: A Journal of Highway Research. Washington: U.S. Federal Highway Administration, 1918.
Lua MLA (8ú heag.)United States. Federal Highway Administration\nUnited States. Bureau of Public Roads\nUnited States. Federal Highway Administration. Offices of Research, Development, and Technology\nUnited States. Federal Highway Administration. Office of Research and Development. Public Roads: A Journal of Highway Research. U.S. Federal Highway Administration, 1918.