Adam Smith (1843). “An Inquiry Into the Nature and Causes of the Wealth of Nations With a Life of the Author: Also a View of the Doctrine of Smith, Compared with that of the French Economists, with a Method of Facilitating the Study of His Works, from the French of M. Jariner”, p.177
John Locke (2012). “A Letter Concerning Toleration: Latin and English Texts Revised and Edited with Variants and an Introduction”, p.45, Springer Science & Business Media