Lord Philip Dormer Stanhope Chesterfield, Philip Dormer Stanhope Earl of Chesterfield (1855). “The Works of Lord Chesterfield: Including His Letters to His Son, Etc : to which is Prefixed, an Original Life of the Author”, p.74
Bernard Berenson (1962). “The Bernard Berenson Treasury: A Selection from the Works, Unpublished Writings, Letters, Diaries, and Journals of the Most Celebrated Humanist and Art Historian of Our Times, 1887-1958”