Design construction and maintenance of highway safety features and appurtenances - Bowman, Brian L.; Gripne, Don J.; Eckhart, Dennis; Capps, Christopher; Paulk, Randy (National Highway Institute, 2004)
Publication No. FHWA-NHI-04-013--Publication No. FHWA-NHI-04-014--A la cabeza de la port.: FHWA-NHI-380034