1. Vasari, G.Le Vite De’ Più Eccellenti Architetti, Pittori Et Scultori Italiani, Da Cimabue Insino a’ Tempi Nostri;Letteratura italiana Einaudi:Firenze, 1550; p965.
2. Merrifield, M. P.Original Treatises, Dating from the XIIth to the XVIIIth Centuries, on the Arts of Painting in Oil, Miniature, Mosaic, and on Glass; of Gilding, Dyeing, and the Preparation of Colours and Artificial Gems;John Murray, Albemarle Street:London, 1849; p641.
3. Hawthorne, J. G.; Smith, C. S.Theophilus. De Diversis Artibus or Schedula Diversarum Artium. Translated from the Latin with Introduction and Notes;Dover Publications/University of Chicago Press 1963, reprinted:New York, 1979; p216.
4. Cennini, C.Il Libro Dell’arte O Trattato Della Pittura 1437;Le Monnier:Firenze, 1859; p207.
5. da Vinci, L.Trattato Della Pittura 1270;Giacomo Langlois:Paris, 1651; p62.