Triple Combination : Book of Mormon; Doctrine and Covenants; Pearl of Great Price by The Church of Jesus Christ of Latter-day Saints (1981, Trade Paperback)
As a "gentile" to the Latter Day Saint religion, I found this triple Combination very valuable when considering the Latter Day Saint religion. I have many friends who are Latter Day Saints and now, with some knowledge, I can have discussions with them regarding their faith. I would not try to dissuade them but only to get their perspective on the doctrine. Having read what they have read, I can better engage in intellectual discussion.