(2012). National Gallery Technical Bulletin: Vol. 33. National Gallery Company.
Cita Chicago (17th ed.)National Gallery Technical Bulletin: Vol. 33. London: National Gallery Company, 2012.
Cita MLA (8th ed.)National Gallery Technical Bulletin: Vol. 33. National Gallery Company, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.