Suhrbier, J. H., Prokopy, J. C., & Sullivan, E. C. (1968). ICES Roads I: Roadway analysis and design system : engineers reference manual. Massachusettes Institute of technology, Department of Civil Engineering, Civil Engineering Systems Laboratory.

Suhrbier, John H., John C. Prokopy, and Edward C. Sullivan. ICES Roads I: Roadway Analysis and Design System : Engineers Reference Manual. Cambridge, Mass: Massachusettes Institute of technology, Department of Civil Engineering, Civil Engineering Systems Laboratory, 1968.

Suhrbier, John H., et al. ICES Roads I: Roadway Analysis and Design System : Engineers Reference Manual. Massachusettes Institute of technology, Department of Civil Engineering, Civil Engineering Systems Laboratory, 1968.