1. Lyons, M.J., Bartneck, C.: HCI and the face. HCI (2006)
2. Chudziak, P.: Analiza ekspresji mimiki ludzkiej twarzy za pomocą komputera. Master thesis (under the supervision of Prof. Z. Kowalczuk), Politechnika Gdańska (2015)
3. Ekman, P., Friesen, W.V.: Manual for the Facial Action Coding System. Consulting Psychologists Press (1977)
4. Ekman, P., Friesen, W.V., Hager, J.C.: Facial Action Coding System Investigator’s Guide. A Human Face, Salt Lake City (2002)
5. Darwin, C.: The Descent of Man, and Selection in Relation to Sex. John Murray (1871)