William T. Baxter, The House of Hancock: Business in Boston, 1724-1775 (Cambridge: Harvard University Press, 1945).
William M. Fowler, Jr., The Baron of Beacon Hill: A Biography of John Hancock (Boston: Houghton Mifflin, 1980).
The Massachusetts Historical Society holds three small collections of Hancock Family Papers, containing letters and business accounts of John Hancock and his uncle Thomas Hancock. The Historical Society also holds many letters from Hancock in other manuscript collections. The largest collection of John Hancock manuscripts is held by Baker Library at the Harvard Business School.