BentzenB.L. (1980). Orientation aids. In WelshR., & BlaschB. (Eds.), Foundations of orientation and mobility.New York: American Foundation for the Blind.
2.
JamesG.A., & GillJ.M. (1974). Mobility maps for the visually handicapped: Study of learning and retention of raised symbols.American Foundation for the Blind Research Bulletin, 27, 87–98.
3.
LambertL.M., & LedermanS.J. (1989). An evaluation of the legibility and meaningfulness of potential map symbols.Journal of Visual Impairment & Blindness, 83, 397–403.
4.
PickH.L. (1980). Tactual and haptic perception. In WelshR., & BlaschB. (Eds.), Foundations of orientation and mobility.New York: American Foundation for the Blind.
5.
PreiserW.F.E. (1985). A combined tactile/electronic guidance system for visually impaired persons in indoor and outdoor spaces, in Proceedings of the International Conference on Building Use and Safety Technology.Washington D.C.: National Institute of Building Sciences.