"Morse's Original Telegraph". National Museum of American History, Smithsonian Institution. مؤرشف من الأصل في 2016-04-04. اطلع عليه بتاريخ 2008-06-04.
Morse، Samuel (1863)، "An Argument on the Ethical Position of Slavery in the social system, and its relation to the politics of the day"، New York, Papers from the Society for the Diffusion of Political Knowledge in Slavery Pamphlets # 60، Beinecke Rare Book and Manuscript library, Yale University Quoted in Yale, Slavery, & Abolition، مؤرشف من الأصل في 2019-09-21 — an online report about Yale honorees and their relation to slavery
Morse، Samuel (1863)، "An Argument on the Ethical Position of Slavery in the social system, and its relation to the politics of the day"، New York, Papers from the Society for the Diffusion of Political Knowledge in Slavery Pamphlets # 60، Beinecke Rare Book and Manuscript library, Yale University Quoted in Yale, Slavery, & Abolition، مؤرشف من الأصل في 2019-09-21 — an online report about Yale honorees and their relation to slavery