Oscar Wilde, Russell Jackson, Joseph Bristow, Ian Small (2000). “The Complete Works of Oscar Wilde: The picture of Dorian Gray : the 1890 and 1891 texts”, p.171, Oxford University Press on Demand
To Colonel Elias Dayton, 26 July 1777; cited in Helgerson, CIA Briefings (1996). When President Kennedy visited CIA in January 1961 he saw this letter on display and asked for a copy of it. He later wrote to DCI Allen Dulles, "The letter is both a fine memento of my visit with you and a continuing reminder of the role of intelligence in national policy."
Oscar Wilde, Russell Jackson, Joseph Bristow, Ian Small (2000). “The Complete Works of Oscar Wilde: The picture of Dorian Gray : the 1890 and 1891 texts”, p.171, Oxford University Press on Demand