1. Gov.ua. (2017). World and Ukrainian statistics of the deaf and dumb, International Day of the Deaf. [online] Available at: https://www.kmu.gov.ua/news/250293661 (Accessed: 5 October 2021)
2. Uapatents.com. (2014). Description Enable talk system. [online] Available at: https://uapatents.com/9-86748- sistema-enable-talk-inejjbl-tolk.html (Accessed: 6 October 2021)
3. Anthrotronix.com. (2018). Description NuGlove system, Interact system, Droid Agent system. [online] Available at: https://www.anthrotronix.com/ (Accessed: 6 October 2021)
4. Signall.us. (2021). SignALL translate program. [online] Available at: https://www.signall.us/ (Accessed: 6 October 2021)
5. D. Mheill. "Gesture and Thought", University of Chicago Press, Degruyter, 2005. DOI: 10.7208/9780226514642.