This is the book I referenced on this weeks Crafter Gathering last Wednesday night. I recommend looking for used copies online if the Amazon one is too expensive. I haven't made any of the patterns out of it but I have wanted to. It calls blankets rugs, and one of the blanket patters are a group of tunisian in the round squares - this uses a double ended hook to do tunisian in the round. I've made a few squares from another pattern and a cowl in tunisian in the round. I'm still learning it.
Crochet Techniques (Milner Craft Series) Paperback – March 4, 2008