1. Beauty as an emotion: the exhilarating prospect of mastering a challenging world;Armstrong;Rev. Gen. Psych.,2008
2. Art Gallery of Ontario, 2011. Abstract Expressionist New York: Masterpieces from the Museum of Modern Art (Exhibition Text). http://www.ago.net/assets/files/pdf/AbEx-CompleteText.pdf.
3. Tolstoy and His Problems;Aylmer,1902
4. Mark Rothko 1903–1970;Baal-Teshuva,2003
5. Bacci, F., Melcher, D., 2012. Questione di gusto o c’è un interruttore universale? La Stampa (December 19, 2012) TuttoScienze section, p. 3.