Homer T. Rosenberger (1969–1970). „Harriet Lane Johnston and the Formation of a National Gallery of Art“. Records of the Columbia Historical Society, Washington, D.C. 69/70: 402. JSTOR40067721.CS1-ის მხარდაჭერა: თარიღის ფორმატი (link)
Homer T. Rosenberger (1969–1970). „Harriet Lane Johnston and the Formation of a National Gallery of Art“. Records of the Columbia Historical Society, Washington, D.C. 69/70: 435–436. JSTOR40067721.CS1-ის მხარდაჭერა: თარიღის ფორმატი (link)
Leslie Judd Portner (August 3, 1958). „Government and the world of art“. The Washington Post. p. E7. ციტატა: „Rep. Thompson introduced a bill providing that the building be transferred to the Smithsonian for its art collection and for a National Portrait Gallery. This bill became law on March 28.“ – via ProQuest (ფასიანი რეგისტრაცია)
SIA RU000092, Smithsonian Institution, Prints and Drawings, 1840-. Smithsonian Institution. ციტატა: „Also included are... copies of drawings for the proposed National Gallery of Art (never constructed) by Charles A. Platt, 1924....“ ციტირების თარიღი: January 30, 2018