1. AASHTO. 2007. AASHTO LRFD bridge design specifications. 4th ed. American Association of State and Highway Transportation Officials, Washington, D.C.
2. Abdel-Sayed, G., Bakht, B., and Jaeger, L.G. 1993. Soil-steel bridges: design & construction. McGraw-Hill, New York.
3. ASTM. 2010. Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). ASTM standard D2487. American Society for Testing and Materials, West Conshohocken, Pa.
4. CSA. 2006. Canadian highway bridge design code. CAN/CSA-S6-06. Canadian Standards Association International, Mississauga, Ont.
5. Three-dimensional modeling of soil-steel culverts under the effect of truckloads