There are two excellent books that I would recommend.
Forgiveness ~ How To Make Peace With Your Past And Get On With Your Life by Dr. Sidney B. Simon and Suzanne Simon (ISBN 0-446-39259-6) ~ Based on their popular "Forgiveness" seminar, the author of Getting Unstuck and his wife designed to help readers let go of their pain and get on with their lives.
What Forgiveness Is Not
Forgiveness is not forgetting.
Forgiveness is not condoning.
Forgiveness is not absolution.
Forgiveness is not a form of self-sacrifice.
Forgiveness is not a clear-cut, one-time decision.
What Forgiveness Is
Forgiveness is a by-product of an ongoing healing process.
Forgiveness is an internal process.
Forgiveness is a sign of positive self-esteem.
Forgiveness is letting go of the intense emotions attached to incidents from our past.
Forgiveness is recognizing that we no longer need our grudges and resentments, our hatred and self-pity.
Forgiveness is no longer wanting to punish the people who hurt us.
Forgiveness is accepting that nothing we do to punish them will heal us.
Forgiveness is freeing up and putting to better use the energy once consumed by holding grudges, harboring resentments, and nursing unhealed wounds.
Forgiveness is moving on.
How Can I Forgive You? The Courage To Forgive, The Freedom Not To by Janis Abrahms Spring, Ph.D. (ISBN 0-06-000390-6) ~ Using illustrative material from her nearly 30 years as a therapist, the author outlines four approaches to forgiveness: (1) cheap forgiveness, which she sees as an inauthentic act of peacekeeping that resolves nothing; (2) refusing to forgive, which is categorized as a rigid response that keeps one entombed in hate; (3) acceptance, which is a healing gift that asks nothing of the offender; and (4) genuine forgiveness, which the author describes as a healing transaction and an intimate dance. Spring has discovered that we are all looking for "some new approach, that frees us from the corrosive effects of hate, gives voice to the injustice, and helps us to make peace with the person who hurt us and with ourselves." This self-help book is aimed at those who have done wrong and those who have been wronged.