A few weeks ago, a neighbor asked me why the Bible is not enough for us Latter-Day Saints. We had a really nice discussion about it. I later made this handout to collect ideas about what to say to people about the Book of Mormon and other scriptures we have. Many people think that the Bible makes a person a Christian but the early Christians didn't even have the Bible as it was put together later on.
I don't know why people think the Bible must be the only scripture. For example, if someone found the writings of the other 2/3 early Apostles, would they accept those writings as scripture? I'm so grateful that I know that God still speaks to us, His children. The heavens are not closed. Revelation flows down to Earth just like raindrops from clouds.
I forgot one important resource from my own list:
