Zöllner, F. From the Face to the Aura: Leonardo da Vinci's Sfumato and the History of Female Portraiture / Frank Zöllner. Inventing faces : rhetorics of portraiture between Renaissance and Modernism.(2013).
Chicago-viite (17. p.)Zöllner, Frank. "From the Face to the Aura: Leonardo Da Vinci's Sfumato and the History of Female Portraiture / Frank Zöllner." Inventing Faces : Rhetorics of Portraiture Between Renaissance and Modernism.(2013) .
MLA-viite (8. p.)Zöllner, Frank. "From the Face to the Aura: Leonardo Da Vinci's Sfumato and the History of Female Portraiture / Frank Zöllner." Inventing Faces : Rhetorics of Portraiture Between Renaissance and Modernism.(2013), .
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.