J. J. Pollitt, Personal Styles in Greek Sculpture, 1999, Cambridge University Press, ISBN0521657385, 9780521657389, google books; "Art Of Ancient Greece, Brief History (1050- 50 b.C.), Georgia Kokkorou- Aleyra
Gunderson, Jessica, Gothic Art, p. 36, 2008, The Creative Company, ISBN1583416102, 9781583416105, google books
metmuseum.org
The Metropolitan Museum of Art (2007). "Donatello (ca. 1386–1466)". The Metropolitan Museum of Art. Retrieved November 20, 2007.
