1. American Foundation for the Blind. (n.d.-a). Books in braille. https://www.afb.org/about-afb/history/online-museums/life-and-legacy-louis-braille/braille-nvents-his-code/books
2. American Foundation for the Blind. (n.d.-b). Chronology of events in the history of education of people who are visually impaired. https://www.afb.org/online-library/unseen-minority-0/historical-chronologies/history-education-visually-impaired-people
3. American Foundation for the Blind. (n.d.-c). Louis invents decapoint. https://www.afb.org/about-afb/history/online-museums/life-and-legacy-louis-braille/braille-nvents-his-code/decapoint
4. American Foundation for the Blind. (n.d.-d). Screen reading technology and refreshable braille displays. https://www.afb.org/blindness-and-low-vision/using-technology/assistive-technology-videos/screen-reading-technology
5. Bogart, D. (2009). Unifying the English braille codes. Journal of Visual Impairment and Blindness, 103(10), 581–583.