There are many excellent books about grieving and grief. Among them:
George A. Bonanno, The Other Side of Sadness: What the new Science of Bereavement Tells Us About Life After Loss (Basic Books 2009)
Allen Klein, The Courage to Laugh: Humor, Hope, and Healing in the Face of Death and Dying (Tarcher/Putnam 1998)
Judy Tatelbaum, The Courage to Grieve: The Classic Guide to Creative Living, Recovery, and Growth Through Grief (Harper 1994, 2008)
Brook Noel & Pamela D. Blair, PhD, I Wasn’t Ready to Say Goodbye: Surviving, Coping & Healing After the Sudden Death of a Loved One (Champion Press, Ltd. 2000; updated Sourcebooks, Inc. 2008)
Genevieve Davis Ginsburg, Widow to Widow: Thoughtful, Practical Ideas for Rebuilding Your Life (De Capo Press 1995)