National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, & Stark, T. D. (2004). Guideline and recommended standard for Geofoam applications in highway embankments. Transportation Research Board, National Research Council.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, و Timothy D. Stark. Guideline and Recommended Standard for Geofoam Applications in Highway Embankments. Washington, D.C: Transportation Research Board, National Research Council, 2004.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Cooperative Highway Research Program, et al. Guideline and Recommended Standard for Geofoam Applications in Highway Embankments. Transportation Research Board, National Research Council, 2004.