Philip Brownell 
Handbook for Theory, Research, and Practice in Gestalt Therapy (2nd Edition) [PDF ebook] 

This is a true second edition, so much so that it approaches being a different book. It includes among its new authors some of the most sought-after theorists in contemporary gestalt therapy. There is a section on the philosophy of science, research and research methodology, and one devoted to gestalt therapy and its teaching and research in diverse parts of the world. There is disagreement and critique, for this is not a simple book. It is so packed with information that it serves as both a challenge and a resource. This second edition of the Handbook will take its place as an aid in understanding the evolution of contemporary gestalt therapy and as a guide to the evolving research tradition in gestalt therapy. It rightfully belongs on the shelves of both beginning trainees in gestalt therapy and advanced and experienced practitioners, and certainly represents a resource for practitioner-researchers involved in practice-based research.