Start with high-confidence end of life care books, then narrow by subgenre or adjacent topics.
The Needs of the Dying
David Kessler
The Lost Art of Dying
L.S. Dugdale, Lydia S. Dugdale
Sometimes My Heart Goes Numb
Charles Garfield, Cindy Spring
When Is It Right to Die?
Joni Eareckson Tada
Nothing to Fear
Julie McFadden RN, Julie McFadden
Being Mortal
Atul Gawande
A Beginner's Guide to the End
Dr. BJ Miller, Shoshana Berger