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[http://www.nga.gov/content/ngaweb/research/casva/research-projects.html A Project of the National Gallery of Art, Center for Advanced Study in the Visual Arts ]
Thomas Kelah Wharton, "Crystal Cove, Hyde Park. New York," 1839, pen and ink, Manuscripts and Archives Division, The New York Public Library.
Manuscripts and Archives Division, The New York Public Library. "Crystal Cove, Hyde Park. New York" New York Public Library Digital Collections. Accessed August 31, 2015. http://digitalcollections.nypl.org/items/510d47e3-4f92-a3d9-e040-e00a18064a99