Primitive Amish Colorful Shaker Quilts Antique Hand Made

I have these wonderful quilts and I was wondering if anyone could help with any information about them. I know that they are shaker or Amish and I think they are rather old. They came from my dad's collection and I was trying to find out more about them. Especially trying to find out the quilt making style and how I could find out more information about them. I have seen lots of quilts on the web and the prices go from a couple hundred, to thousands of dollars. Any information would be greatly appreciated.