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Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "One of the pioneers in the Underground Movement in Philadelphia and New York; Mr. Hopper is supposed to have resorted to underground methods as early as 1787." The New York Public Library Digital Collections. 1898. https://qa-digitalcollections.nypl.org/items/510d47dd-ff45-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "One of the pioneers in the Underground Movement in Philadelphia and New York; Mr. Hopper is supposed to have resorted to underground methods as early as 1787." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47dd-ff45-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1898). One of the pioneers in the Underground Movement in Philadelphia and New York; Mr. Hopper is supposed to have resorted to underground methods as early as 1787. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47dd-ff45-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47dd-ff45-a3d9-e040-e00a18064a99 | title=
(still image)
One of the pioneers in the Underground Movement in Philadelphia and New York; Mr. Hopper is supposed to have resorted to underground methods as early as 1787., (1898)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>