Institute for the Certification of Engineering Technicians, National Society of Professional Engineers, American Association of State Highway and Transportation Officials, United States. Federal Highway Administration, United States. National Highway Institute, Snarponis, J. M., & Glab, J. E. (1977). Certification of transportation engineering technicians: A program. Washington : Springfield, Va.: Federal Highway Administration ; Available through the National Technical Information Service.

Institute for the Certification of Engineering Technicians, National Society of Professional Engineers, American Association of State Highway and Transportation Officials, United States. Federal Highway Administration, United States. National Highway Institute, Joseph M. Snarponis, and John E. Glab. Certification of Transportation Engineering Technicians: A Program. Washington : Springfield, Va.: Federal Highway Administration ; Available through the National Technical Information Service, 1977.

Institute for the Certification of Engineering Technicians, et al. Certification of Transportation Engineering Technicians: A Program. Washington : Springfield, Va.: Federal Highway Administration ; Available through the National Technical Information Service, 1977.