National Research Council (U.S.). Transportation Research Board. Committee on Bicycling and Bicycle Facilities. (1988). Bicycling and bicycle facilities research problems statements. Transportation Research Board, National Research Council.
Lua i Stíl Chicago (17ú heag.)National Research Council (U.S.). Transportation Research Board. Committee on Bicycling and Bicycle Facilities. Bicycling and Bicycle Facilities Research Problems Statements. Washington, D.C: Transportation Research Board, National Research Council, 1988.
Lua MLA (9ú heag.)National Research Council (U.S.). Transportation Research Board. Committee on Bicycling and Bicycle Facilities. Bicycling and Bicycle Facilities Research Problems Statements. Transportation Research Board, National Research Council, 1988.