1. American Foundation for the Blind (2002). Statistics and sources for professionals. Retrieved June 12, 2002. Available: http://www.afb.org/info_document_view.asp?documentid=1367.
2. A new class of auditory warning signals for complex systems: auditory icons;Belz;Human Factors,1999
3. Earcons and icons: their structure and common design principles;Blattner;Human–Computer Interaction,1989
4. Spatial hearing;Blauert,1996
5. 3-D Sound for virtual reality and multimedia;Begault,1994