National Research Council (U.S.). Transportation Research Board. Committee on Operational Effects of Geometrics. (1982). Research problem statements: Operational effects of geometrics. Transportation Research Board, National Academy of Sciences.
Lua i Stíl Chicago (17ú heag.)National Research Council (U.S.). Transportation Research Board. Committee on Operational Effects of Geometrics. Research Problem Statements: Operational Effects of Geometrics. Washington, DC: Transportation Research Board, National Academy of Sciences, 1982.
Lua MLA (9ú heag.)National Research Council (U.S.). Transportation Research Board. Committee on Operational Effects of Geometrics. Research Problem Statements: Operational Effects of Geometrics. Transportation Research Board, National Academy of Sciences, 1982.