National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Special Committee on Electronic Research in the Highway Field, & National Research Council (U.S.). Highway Research Board. Committee on Traffic Control Devices. (1968). Route guidance: 5 reports. Highway Research Board, National Research Council.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Special Committee on Electronic Research in the Highway Field, και National Research Council (U.S.). Highway Research Board. Committee on Traffic Control Devices. Route Guidance: 5 Reports. Washington, D.C: Highway Research Board, National Research Council, 1968.
Παραπομπή σε μορφή MLA (9th εκδ.)National Research Council (U.S.). Highway Research Board, et al. Route Guidance: 5 Reports. Highway Research Board, National Research Council, 1968.