Benjamin Franklin, William-Temple Franklin (1818). “Memoirs of the Life and Writings of (the Same), Continued to the Time of His Death by William Temple Franklin. - London, H. Colburn 1818”, p.270
Thomas F. Jackson, Martin Luther King (Jr.) (2007). “From Civil Rights to Human Rights: Martin Luther King, Jr., and the Struggle for Economic Justice”, p.230, University of Pennsylvania Press