Quoted in Francis Wheen (July 2001). Karl Marx: A Life. W. W. Norton & Company. ISBN978-0-393-32157-9. Retrieved 8 March 2011., pages 25-26. Wheen points out the similarity between this passage and the one in Eighteenth Brumaire, but his quotation of the latter is a different translation or version than the one which appears above, or is perhaps a garbled combination of the Marx and Engels passages.
