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- Hurlburt, Russell T., and Sarah A. Akhter. “Unsymbolized thinking.”Consciousness and Cognition 17.4 (2008): 1364-1374. https://faculty.unlv.edu/hurlburt/hurlburt-akhter-2008.pdf
- An introduction to Focusing: Six Steps http://www.focusing.org/sixsteps.html
- Self-Therapy by Jay Earley http://www.amazon.com/Self-Therapy-Step—Step-Cutting-Edge-Psychotherapy/dp/0984392777/
So, I actually don’t remember what’s actually in the original Gendlin Focusing book, and there’s not a table of contents on amazon to jog my memory. I remember that it’s pretty good, relatively precise, but also that it’s tedious because it’s written for a popular audience. The goal is to be able to work effectively with nonsymbolic thought in a wide variety of circumstances, creatively towards your own ends, and to jumpstart that as quickly as possible.
(Not everyone needs that, though. Symbolic thought is great, and symbolic thought carries nonsymbolic thought along with it, implicitly.)
Anyway, the first link above defines it. The second link helps for getting a flicker of a sense of it; it’s going on all the time, you just need to learn to “find” it and sort of maybe pin it down a bit. It can take time and practice. The third link, via Internal Family Systems Therapy, provides an excellent, though laborious, step-by-step structure for one way of working with it. (There’s a cheat sheet in the appendix.) Over time, or immediately, you can dispense with the scaffolding and work intuitively with the raw experience. I work most often with the raw experience, but I bring back different kinds of scaffolding frequently, too.
(For more depth, I might recommend Gendlin’s book for professionals . And then there’s Coherence Therapy , which hints more directly at deep structure, and much more… )
 Gendlin, Eugene T. Focusing-oriented psychotherapy: A manual of the experiential method. Guilford Press, 2012.
 Ecker, B., and L. Hulley. “Coherence therapy practice manual and training guide.” Oakland, CA: Pacific Seminars. 2006. http://coherencetherapy.org/resources/manual.htm