Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.84, Graphic Arts Books
Letter to Thomas Manning, 15 February 1802 (quoting from 'The Londoner', no. 1), in E. Marrs (ed.) 'The Letters of Charles and Mary Lamb' vol. 2 (1976) p. 57