1. Dann KT. Bright colors falsely seen: synaesthesia and the search for transcendental knowledge. New Haven : Yale University Press, 1998 : 226 p.
2. Hurlburt RT, Schwitzgebel E. Describing inner experience? Proponent meets skeptic. Cambridge, MA : MIT Press, 2007 : 322 p.
3. Day S. Some demographic and socio-cultural aspects of synesthesia. In : Robertson LC, Sagiv N, eds. Synesthesia: perspectives from cognitive neuroscience. Oxford : Oxford University Press, 2005 : 11–33.
4. Flournoy T. Des phénomènes de synopsie (audition colorée) photismes, schèmes visuels, personnifications. Paris : Alcan, 1893.