By Shafiei, Mohammad, Pietarinen, Ahti-Veikko
By Redmond, Juan, Pombo Martins, Olga, Nepomuceno Fernández, Angel
By Rahman, Shahid, McConaughey, Zoe, Klev, Ansten, Clerbout, Nicolas
By Bongiovanni, Giorgio, Postema, Gerald, Rotolo, Antonino, Sartor, Giovanni, Valentini, Chiara, Walton, Douglas
By Fernández-Fernández, Claudia
By Pisano, Raffaele, Coopersmith, Jennifer, Peake, Murray
By Stearn, Margaret, Moore, Edna, Rayner, Claire
By Mayblin, Bill, Cryan, Dan, Shatil, Sharron
By Hodges, Wilfred, Wilfrid
By Kneale, William and Martha
By Rotenstreich, Nathan
By Aristotle, Ackrill, J. L.
By Kant, Immanuel, Watkins, Eric, Pluhar, Werner S.
By Hartnack PhD, Justus
By Alfred J. Ayer
By Quine, W. V.
By Oswald Hanfling
By Owen, David
By Carnap, Rudolf
By Kenny, Sir Anthony
By Wittgenstein, Ludwig
By Stroll, Avrum
By Ishiguro, Hide
By Heaton, John, Groves, Judy
By Plenderleith, Allan
By Boolos, George S., Jeffrey, Richard C.
By Pitty, A.F.
By Barker–plummer, David, Barwise, Jon, Etchemendy, John
By Edward de Bono
By How2Become, .