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
sir John Barnard, Benjamin Franklin (1848). “A present for an apprentice [by sir J. Barnard]. To which is added, Franklin's Way to wealth. [Ed.] by a citizen of London [T. Tegg].”, p.288