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Schomburg Center for Research in Black Culture, Art and Artifacts Division, The New York Public Library. "Newton Seale Congress Assembly button" The New York Public Library Digital Collections. 1968. https://old-digitalcollections.nypl.org/items/102849d0-7473-013e-307f-0242ac110003
Schomburg Center for Research in Black Culture, Art and Artifacts Division, The New York Public Library. "Newton Seale Congress Assembly button" New York Public Library Digital Collections. Accessed September 20, 2026. https://old-digitalcollections.nypl.org/items/102849d0-7473-013e-307f-0242ac110003
Schomburg Center for Research in Black Culture, Art and Artifacts Division, The New York Public Library. (1968). Newton Seale Congress Assembly button Retrieved from https://old-digitalcollections.nypl.org/items/102849d0-7473-013e-307f-0242ac110003
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/102849d0-7473-013e-307f-0242ac110003 | title=
(three dimensional object)
Newton Seale Congress Assembly button, (1968)|author=Digital Collections, The New York Public Library |accessdate=September 20, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>