* Denis the Carthusian wrote two treatises to refute Islam at the request of Nicholas of Cusa, "Contra perfidiam Mahometi, et contra multa dicta Sarracenorum libri quattuor" and "Dialogus disputationis inter Christianum et Sarracenum de lege Christi et contra perfidiam Mahometi".
** "Contra perfidiam Mahometi, et contra multa dicta Sarracenorum libri quattuor";** "Dialogus disputationis inter Christianum et Sarracenum de lege Christi et contra perfidiam Mahometi".