From Freedom to Slavery, by Gerry Spence
Written by Randy Weaver's defense attorney, the second chapter of the paperback edition is one of the best accounts of what happened at Ruby Ridge. With Gerry Spence's permission, it is reproduced here.
You can order your own copy from Barnes & Noble on-line. Be sure to get the "mass-market paperback" edition. The Ruby Ridge chapter is not in the other editions.