In additional to Malcolm Fraiser's book, I also found this one interesting and helpful: http://www.mnsu.edu/comdis/kuster/Infostuttering/Harrison/redefining-stuttering.pdf But I honestly think the best and easiest to consume resource is a great podcast called Stuttertalk (www.stuttertalk.com). Check out the 5 segment series with Vivian Sisskin. That's what i've found is best for me.