Northup, Solomon (1969) [1853]. Osofsky, Gilbert. ed. Puttin' On Ole Massa: The Slave Narratives of Henry Bibb, William Wells Brown, and Solomon Northup. Harper & Row. p. 260. LCCN69-17285
lsupress.org
Solomon Northup. “Twelve Years A Slave”. Louisiana State University Press. 2013年9月26日閲覧。
minneapolisfed.org
Federal Reserve Bank of Minneapolis Community Development Project. "Consumer Price Index (estimate) 1800–" (英語). Federal Reserve Bank of Minneapolis. 2019年1月2日閲覧。
Northup (1997, pp. 325–326), APPENDIX. B. Memorial of Anne より引用。 "That your memorialist, whose maiden name was Anne Hampton, was forty-four years old on the 14th day of March last, and was married to Solomon Northup, then of Fort Edward, in the county of Washington and State aforesaid, on the 25th day of December, A. D. 1828, by Timothy Eddy, then a Justice of the Peace. [中略] That the said Solomon is about forty-five years of age, and never resided out of the State of New-York, in which State he was born, until the time he went to Washington city, as before stated.[中略] (Signed,) ANNE NORTHUP. Dated November 19,1852."
