1. Status and the left cheek;NK Humphrey;New Scientist,1973
2. Turning the other cheek: profile direction in self-portraiture;R Latto;Empirical studies of the Arts,1996
3. Positioning Bias in Portraits and Self-Portraits: Do Female Artists Make different Choices?;C Suitner;Empirical Studies of the Arts,2007
4. Landauer, cited by ref. 1.
5. Calabrese O (2010) L’arte dell’autoritratto: storia e teoria di un genere pittorico. Firenze: VoLo publisher,Usher arte. 396 p. English translation: Calabrese O (2006) Artists’ Self-Portraits. New York: Abbeville Press. 391 p.