William Cowper (1851). “The Works of William Cowper: His Life, Letters, and Poems. Now First Completed by the Introduction of Cowper's Private Correspondence”, p.556
Frederick William Robertson (1850). “An address delivered to the members of the Working Man's Institute, at the Town Hall, Brighton, on Thursday, April 18, 1850, on the question of the introduction of sceptical publications into the library”, p.13