1. Altix. (n.d.). Tactile graphics, maps for the bilnd/terminale informacyjne. Retrieved November 25, 2015, from http://sklep.altix.pl/en/terminale-informacyjne
2. American Foundation for the Blind. (n.d.). Retrieved January 16, 2018, from https://www.afb.org/default.aspx
3. Doi, K. (2007). Improvement in transparent-resinous-ultraviolet-curing-type Braille reading (Doctoral Thesis). Waseda University. (in Japanese)
4. Influence of Base Material on Transparent-Resinous-Ultraviolet-Curing-Type Braille Reading
5. Doi, K., Nishimura, T., Wada, T., & Fujimoto, H. (2017). Introduction of Newly Production Method to Create In-school Tactile Guide Maps for Children with Visually Impairments-Using New Production Device of Tactile Guide Map Made by Transparent Resinous Ultraviolet Cured Type Ink. Abstracts of First international conference of Tactile Reading 2017. Retrieved March 1, 2018, from https://www.mtm.se/en/tactilereading2017/speakers/Posters/kouki-doi/