Sir Joshua Reynolds, Edward Malone (1867). “The Works of Sir Joshua Reynolds: Containing His Discourses, Idlers, A Journey to Flanders and Holland, and His Commentary on Du Fresnoy's Art of Painting; to which is Prefixed an Account of the Life and Writings of the Author by Edward Malone”, p.114
"Principles of political economy considered with a view to their practical application". Book by Thomas Malthus, Book II, Chapter I, "On The Progress of Wealth", Section X, p. 414, 1836.