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Twenty-eight years a slave : or, The story of my life in three continents
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "C. H. Richardson; Mrs. Richardson; T. L. Johnson; Mrs. Johnson; Group of Missionaries; The African Mission." The New York Public Library Digital Collections. 1909. https://digitalcollections.nypl.org/items/510d47df-a275-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "C. H. Richardson; Mrs. Richardson; T. L. Johnson; Mrs. Johnson; Group of Missionaries; The African Mission." New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/510d47df-a275-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1909). C. H. Richardson; Mrs. Richardson; T. L. Johnson; Mrs. Johnson; Group of Missionaries; The African Mission. Retrieved from https://digitalcollections.nypl.org/items/510d47df-a275-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47df-a275-a3d9-e040-e00a18064a99 | title=
(still image)
C. H. Richardson; Mrs. Richardson; T. L. Johnson; Mrs. Johnson; Group of Missionaries; The African Mission., (1909)
|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>