Books for Kids ... about suicide
After a Parent's Suicide: Helping Children Heal Margo Requarth, Healing Hearts Press, 2006. Written by a bereavement counselor who lost her own mother to suicide when she was just less than four years old, this book offers constructive, compassionate and clear suggestions for helping children. After a Suicide: A Workbook for Grieving Kids 

Developed for use with children by the Dougy Center for Grieving Children, this workbook combines explanations of mental illness and suicide, creative exercises, practical advice, and quotations from child survivors. Chapter headings include: “What is suicide? Why do people die by suicide? Feelings, Dreams and Nightmares, Going Back to School” and more.
But I Didn't Say Goodbye : For parents and professionals helping child suicide survivors
Barbara Rubel. Grief work Center, Inc., 2000. Survivors report that this is a nice book, with short chapters. This book is designed to be read with your child. There are questions at the end of the chapter which create an opportunity for the child reader to discuss his or her own experience. 
Someone I Love Died by Suicide : A Story for Child Survivors and Those Who Care for Them
A compassionate and supportive book for children who have experienced loss due to suicide. The issue is sensitively handled and practical, healthy ways of coping are addressed. The book explains that what happened is not the child’s fault.