I just finished a book named
The Insider. Dad lent it to me. It is relevant to me, because I interact with nonChristians throughout my day as an "insider", that is, I didn't come to preach to people from the "outside". I am on the inside, as a normal part of my relational networks.

It was a refreshing book. It wasn't another one that told me how to do the Bridge diagram, or how to say just the right words to make someone a Christian. It speaks more realistically to my situation, where through prayer and the way you relate to others, you eventually get into
natural conversations about Christ, without having an agenda for that conversation. Also, the purpose is not to get people into church. Also, the book says churches should Insiders more validity as a ministry, and not pressure people to give all their time to the church. There is also a segment on how to lead a small group.
The book validates the idea that as a Christian you don't want force Christ upon someone, and then make the relationship awkward from that point on. Christians should also not separate themselves from nonChristians to the point where they live socially isolated lives. I have had many experiences like that in high school and college, and I learned from them. This book was helpful, because it told me that my experience is not too uncommon, and it shows a better way.