Berry, Faith (2006). From Bondage to Liberation: Writings by and about Afro-Americans. A&C Black. s. 92. ISBN9780826418142. Besøkt 24. august 2014. «[Knapp's] gambling debts caused Garrison's supporters to buy out Knapp's financial interest [in The Liberator]. He later claimed fraud and published one issue of Knapp's Liberator, attacking Garrison, on January 8, 1842.»
Walter McIntosh Merrill (1956). «PassionateAttachment: William Lloyd Garrison's Courtship of Helen Eliza Benson». New England Quarterly. 29. JSTOR362183.
