What on Earth Do You Do When Someone Dies? by Trevor Romain

Lifetimes: The beautiful way to explain death to children 
by Bryan Mellonie and Robert Ingpen

The Saddest Time by Norma Simon

When Someone Dies by Sharon Greenlee

When A Pet Dies by Fred Rogers (pet loss)

Sad Isn't Bad: A Good-Grief Guidebook for Kids Dealing With Loss 
by Michaelene Mundy