National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, National Research Council (U.S.). Committee on Geometric Highway Design, & National Research Council (U.S.). Committee on Guardrail, Median Barriers and Sign, Signal and Lighting Supports. (1970). Geometric design: Protective barrier systems; luminaire supports : 6 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. Meeting, National Research Council (U.S.). Committee on Geometric Highway Design, και Median Barriers and Sign National Research Council (U.S.). Committee on Guardrail. Geometric Design: Protective Barrier Systems; Luminaire Supports : 6 Reports. Washington: Highway Research Board, National Research Council, 1970.
Παραπομπή σε μορφή MLA (9th εκδ.)National Research Council (U.S.). Highway Research Board, et al. Geometric Design: Protective Barrier Systems; Luminaire Supports : 6 Reports. Highway Research Board, National Research Council, 1970.