Here is a list of resources that have helped me the past year.
A grief observed C.S.Lewis
When we hurt Philip Yancey
Changes that Heal Henry Cloud
The problem of Pain C.S. Lewis
Second Guessing God
The Bible (Mainly Job and Psalms)
Also I would add that most funeral homes have great resources about talking with kids about death, how to deal with loss ect.
Lastly it’s not a resource that you can buy but being able to talk through stuff and receive prayer all within healthy community. We all need others and that need is never more evident than when you are hurting.