"Treaty of Tripoli". Treaty of Peace and Friendship between the United States of America and the Bey and Subjects of Tripoli of Barbary signed by President John Adams (Article 11), www.huffingtonpost.com. June 10, 1797.
Douglas Adams (2012). “The Hitchhiker's Guide to the Galaxy Radio Scripts Volume 2: The Tertiary, Quandary and Quintessential Phases”, p.111, Pan Macmillan