Adam Smith (1869). “Essays On, I. Moral Sentiments: II. Astronomical Inquiries; III. Formation of Languages; IV. History of Ancient Physics; V. Ancient Logic and Metaphysicis; VI. The Imitative Arts; VII. Music, Dancing, Poetry; VIII. The External Senses; IX. English and Italian Verses”, p.57
Adam Smith (1817). “The Theory of Moral Sentiments: Or, An Essay Towards an Analysis of the Principles by which Men Naturally Judge Concerning the Conduct and Character, First of Their Neighbours, and Afterwards of Themselves : to which is Added, A Dissertation on the Origin of Languages”, p.379
Adam Smith (2007). “The Wealth of Nations: An Inquiry Into the Nature and Causes of the Wealth of Nations: With an introduction by Jonathan B. Wight, University of Richmond”, p.755, Harriman House Limited
Adam Smith (2007). “The Wealth of Nations: An Inquiry Into the Nature and Causes of the Wealth of Nations: With an introduction by Jonathan B. Wight, University of Richmond”, p.400, Harriman House Limited