Hirsch, T. J., Smith, H. L., & Ivey, D. L. (1969). Timber post energy absorbing protective barrier. Texas Transportation Institute, Texas A & M Research Foundation.
Chicago Style (17th ed.) CitationHirsch, T. J., Harry L. Smith, and Don L. Ivey. Timber Post Energy Absorbing Protective Barrier. [College Station, Tex.]: Texas Transportation Institute, Texas A & M Research Foundation, 1969.
MLA (9th ed.) CitationHirsch, T. J., et al. Timber Post Energy Absorbing Protective Barrier. Texas Transportation Institute, Texas A & M Research Foundation, 1969.
Warning: These citations may not always be 100% accurate.