Sydney Smith, Sarah Austin, Lady Saba Smith Holland Holland (1855). “A Memoir of the Reverend Sydney Smith”, p.138, London, Longman, Brown, Green, and Longmans
In 'Sidney Smith: His Wit and Wisdom' (1900) p. 89 Science is his forte, and omniscience his foible. On William Whewell, in Isaac Todhunter 'William Whewell' (1876) vol. 1, p. 410
Sydney Smith, Sarah Austin, Lady Saba Smith Holland Holland (1855). “A Memoir of the Reverend Sydney Smith”, p.353, London, Longman, Brown, Green, and Longmans
Sydney Smith (1854). “Elementary Sketches of Moral Philosophy, Delivered at the Royal Institution, in the Years 1804, 1805, and 1806 by the Late Rev. Sydney Smith, M.A”, p.348