1. https://www.sparknotes.com/lit/odyssey/full-text/book-ix/
2. Oedipus and the Sphinx, in M. Kallich, Oedipus: Myth and Drama, Bobbs-Merrill Co, June 1, 1968, ISBN-13: 978-0672630767
3. Assistive Technology Act of 1998, Retrieved from http://www.gpo.gov/fdsys/pkg/PLAW-108publ364/html/PLAW-108publ364.htm
4. Assistive Technology from Ancient to Modern Times. (n.d.). Retrieved from http://bluebirdcare.ie/assistive-technology-ancient-modern-times/
5. S. Chang, Disability in Smart Cities: Assessing Assistive Technologies and Urban Accessibility. Oxford Urbanists, (January 11, 2019), https://www.oxfordurbanists.com/