== المصادر ==== لقراءة أوسع ==*David Cannadine, "Mellon: An American Life", Knopf, 2006, ISBN 0-679-45032-7*"The National Gallery of Art, Washington", special number of "Connaissance des Arts", Société Français de Promotion Artistique (2000) ISSN 1242-9198*Official Web site*Current Exhibitions at the National Gallery of Art*Online Gallery of Artwork in the NGA*Center for Advanced Study in the Visual Arts
* "The Voyage of Life" by Thomas Cole==References==== Further reading ==*David Cannadine, "Mellon: An American Life", Knopf, 2006, ISBN 0-679-45032-7*Neil Harris, "Capital Culture: J. Carter Brown, the National Gallery of Art, and the Reinvention of the Museum Experience", University of Chicago Press, 2013, ISBN 9780226067704*"The National Gallery of Art, Washington", special number of "Connaissance des Arts", Société Français de Promotion Artistique (2000) ISSN 1242-9198== External links ==*Official Web site*Current Exhibitions at the National Gallery of Art*Online Gallery of Artwork in the NGA*Center for Advanced Study in the Visual Arts