BentzenB.L., & MitchellP.A. (1995). Audible signage as a wayfinding aid: Comparison of Verbal Landmarks® and Talking Signs®.Journal of Visual Impairment & Blindness, 89, 494–505.
2.
CrandallW., BentzenB.L., MyersL., & MitchellP.A. (1995). Transit accessibility improvement through Talking Signs® remote infrared signage: A demonstration and evaluation. Final report to U.S. Department of Transportation, Federal Transit Administration and Project ACTION of the National Easter Seal Society.