Online Text Treasures of Art in Great Britain: Being an Account of the Chief Collections of Paintings, Drawings, Sculptures, Illuminated Mss., &c., &c, By Gustav Friedrich Waagen, Elizabeth Rigby Eastlake, Algernon Graves. Translated by Elizabeth Rigby Eastlake, published by J. Murray, 1854, (Original from the New York Public Library) Art as Existence Gabriele Guercio - The MIT Press, 2006 Gustav Waagen in the Dictionary of Art Historians