United States. Bureau of Public Roads. (1931). Highways in U.S.A. and its possessions. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Bureau of Public Roads. Highways in U.S.A. and Its Possessions. Washington: U.S. GPO, 1931.
MLA (9th ed.) CitationUnited States. Bureau of Public Roads. Highways in U.S.A. and Its Possessions. U.S. GPO, 1931.
Warning: These citations may not always be 100% accurate.