References and Further Reading

Elliott, Virgil (2007) 'Techniques of Painting in Oils', Traditional Oil Painting: Advanced Techniques and Concepts from the Renaissance to the Present​, Chapter 6, Watson-Guptill.

Encyclopaedia Britannica (2015) ‘Sfumato’, Encyclopaedia Britannica, 15 October, Available Online [1 November 2015].

The National Gallery (n. d.) ‘Mysterious Virgin’ in Paintings, Learn about art, Paintings in depth, The National Gallery, Available Online [1 November 2015].