2Oz-Salzberger, Introduction. Adam Ferguson, An Essay on the History of Civil Society, Cambridge: Cambridge University Press, 1995, p.ix, xxv, xvii, xxiii, xxv.
3The McGraw-Hill Encyclopedia of World Biography, VoL4, New York: McGraw-Hill Book Company, 1973, p.89.
4A. Broadie ed., The Scottish Enlightenment, Cambridge: Cambridge University Press, 2003, p.12-13.