„Computer Literacy Tests: Are You Human?”, [[Time (magazin)|]]. [2009. április 30-i dátummal az eredetiből archiválva] (Hozzáférés: 2008. június 12.) „The Carnegie Mellon team came back with the CAPTCHA. (It stands for "completely automated public Turing test to tell computers and humans apart"; no, the acronym doesn't really fit.)The point of the CAPTCHA is that reading those swirly letters is something that computers aren't very good at.”
„Computer Literacy Tests: Are You Human?”, [[Time (magazin)|]]. [2009. április 30-i dátummal az eredetiből archiválva] (Hozzáférés: 2008. június 12.) „The Carnegie Mellon team came back with the CAPTCHA. (It stands for "completely automated public Turing test to tell computers and humans apart"; no, the acronym doesn't really fit.)The point of the CAPTCHA is that reading those swirly letters is something that computers aren't very good at.”
