Focusing: How to open up your deeper feelings and intuition
Eugene Gendlin
First published in 1978, this edition was published by Rider in 2003. ISBN 184413220X.
This is the original book that made Focusing available to the public. It breaks Focusing into six steps and has many examples. This is a good beginning introduction to the process.

Focusing-Oriented Psychotherapy: a manual of the experiential method
Eugene Gendlin
Published in 1996 by Guilford Press. ISBN: 157230376X
Examining the actual moment-to-moment process of therapy, this volume provides specific ways for therapists to engender effective movement, particularly in those difficult times when nothing seems to be happening. The book concentrates on the ongoing client therapist relationship and ways in which the therapist's responses can stimulate and enable a client's capacity for direct experiencing and "focusing." Throughout, the client therapist relationship is emphasized, both as a constant factor and in terms of how the quality of the relationship is manifested at specific times. The author also shows how certain relational responses can turn some difficulties into moments of relational therapy.

Let Your Body Interpret your Dreams
Eugene Gendlin
Published in 1985 by Chiron Publications. ISBN: 0933029012
This book shows how Gendlin's method of tapping the body's responses can be applied to the understanding and appreciation of one's dreams. He implies, rightly, that there are many ways of interpreting dreams, based on various theoretical approaches, each with its own validity. Yet, what really counts is the dreamer's somatic response to questions raised or interpretations suggested; the body has the answer.

The Power of Focusing: A Practical Guide to Emotional Self-Healing.
Ann Weiser Cornell
Published in 1996 by New Harbinger Publications. ISBN 157224044X.
This slender volume is the culmination of Ann Weiser Cornell's search for a way to show focusing that many people find easy to understand and follow. There are many examples, sections on typical problems and questions, how to Focus alone and also how to work with a partner, and how to bring Focusing into a therapy setting from the point of view of the therapist or the client. More details here.

The Radical Acceptance of Everything: Living a Focusing Life
Ann Weiser Cornell, and featuring Barbara McGavin
Published in 2005 by Calluna Press
Ann Weiser Cornell's key writings have been brought together in one place, freshly edited for this volume, with four new articles offering her latest leading edge work. All are accessible to both the seeker of personal change and the professional who wants to be more effective working with others.
Copies can be ordered from Focusing Resources.

The Focusing Student's and Companion's Manual: Part One
Ann Weiser Cornell and Barbara McGavin
Published in 2002 by Calluna Press.
ISBN 0 972015808 (part one) ISBN, 0 972015824 (two part set).
In Part One, you learn enough about Focusing and being a Companion to begin practicing immediately, with support for partnerships, practice groups, and solo Focusing. Part One replaces the former "Focusing Student's Manual". Sections covered: The Door Opens, Finding Companions, Making Focusing Your Own, Dwelling at the Edge, The Power of Presence, Becoming Companions. Copies can be ordered from Barbara McGavin.

The Focusing Student's and Companion's Manual: Part Two
Barbara McGavin and Ann Weiser Cornell
Published in 2002 by Calluna Press.
ISBN 0 972015816 (part two) ISBN  0 972015824 (two part set).
Part Two goes deeper, exploring some of the more subtle and challenging aspects of the Focusing process, including what has traditionally been called "guiding", now renamed Reminding. Part Two replaces the former "Focusing Guide's Manual". Sections Covered: Going Deeper, The Path of the Companion, A Reminder or Two, Presence and Partiality.
Copies can be ordered from Barbara McGavin.

Person-Centred Therapy: the focusing-oriented approach
Campbell Purton
Published in 2004 by Palgrave Macmillan.
ISBN 0333969162. More details here.

For information on more focusing books, try the store at the Focusing Institute web site.