1. americanthermoform. 1962 . Swell Touch Paper . Retrieved January 30, 2022 from https://americanthermoform.com/product/swell-touch-paper/. americanthermoform. 1962. Swell Touch Paper. Retrieved January 30, 2022 from https://americanthermoform.com/product/swell-touch-paper/.
2. Nacny Amick and Jane Corcoran . 1997. Guidelines for Design of Tactile Graphics.Retrieved January 17, 2022 from http://www.aph.org/research/guides/ Nacny Amick and Jane Corcoran. 1997. Guidelines for Design of Tactile Graphics.Retrieved January 17, 2022 from http://www.aph.org/research/guides/
3. Form perception with a 49-point electrotactile stimulus array on the tongue: a technical note;Rita Paul;Journal of rehabilitation research and development,1998
4. SPIN (Self-powered Paper Interfaces)
5. Silver Tape