Need Info on the 5-3 Defense!

I too, have been looking for books or resources on the 5-3, but have found very few. I am a youth football coach and tried it in our scrimmage this past Staurday and I thought we did fine with it, but it was just something I was using to hide what we would really run on games that count. I have found resources on the 5-2 but not the 5-3.