I just found out that Louis Bouyer's The Spirit and Forms of Protestantism has been reprinted by Ignatius Press. This is a must-read for any Latter-day Saint who interacts with Protestants. Bouyer was a former Protestant who wrote very fairly on his former faith, but soundly refutes many of the major heresies of Protestantism, such as Sola Fide. See, for e.g., the following blog post:
Louis Bouyer on Transformative and Forensic Justification
Louis Bouyer on Transformative and Forensic Justification