Lutheran Augsburg Confession & Catholic Replies (Intro)
Christian Classics Ethereal Library is a wonderful online source for many historic Christian documents. Laura de Jong, a staff writer there, wrote about Catholic-Protestant "dialogue": based on the Augsburg Confession (Lutheran, 1530), Catholic replies (then and now), & Lutheran Philip Melanchthon's counter-reply.
Johann Eck Confutatio Pontificia Philip Melanchthon Confessio Augustana Martin Luther Council Of Trent
Source: patheos.com