1. Act on Promotion of Smooth Transportation etc. of Elderly Persons Disabled Persons etc (in Japanese). http://www.mlit.go.jp/barrierfree/transport-bf/explanation/kaisetu/kaisetu_.html. Act on Promotion of Smooth Transportation etc. of Elderly Persons Disabled Persons etc (in Japanese). http://www.mlit.go.jp/barrierfree/transport-bf/explanation/kaisetu/kaisetu_.html.
2. Apple iOS Human Interface Guidelines. https://developer.apple.com/library/ios/#documentation/UserExperience/Conceptual/MobileHIG/Introduction/Introduction.html. Apple iOS Human Interface Guidelines. https://developer.apple.com/library/ios/#documentation/UserExperience/Conceptual/MobileHIG/Introduction/Introduction.html.
3. Bmaps. https://bmaps.world/en. Bmaps. https://bmaps.world/en.
4. Cabinet office List of barrier-free maps of major cities in each prefecture. http://www8.cao.go.jp/souki/barrier-free/link/bfmapken.html. Cabinet office List of barrier-free maps of major cities in each prefecture. http://www8.cao.go.jp/souki/barrier-free/link/bfmapken.html.
5. Disability Discrimination Act (in Japanese). http://www8.cao.go.jp/shougai/suishin/sabekai.html. Disability Discrimination Act (in Japanese). http://www8.cao.go.jp/shougai/suishin/sabekai.html.