How to Cope with Grief and Get On with Your Life: Giving Sorrow Words” by Candy Lightner and Nancy Hathaway (1990, Warner Books)

The Bereaved Parent by Harriet Schiff. It is still available in paperback. It
focuses on the unique aspects of losing a child at any age.

The Grief Recovery Handbook by John W. James & Russell Friedman is very good, easy to read for clients and cheap to purchase for them ($14 Canadian). See also