YouTube interview with Johnathan Bi [here](https://www.youtube.com/watch?v=tRjk7aJmYfA).
If you are a materialist, read:
1. Irreducible Mind by Edward Kelly — empirical approach
2. All Things Are Full of Gods by David Bentley Hart — philosophical approach
Firsthand testimonies of near-death experiences: The Self Does Not Die
Dale Allison's own book: Encountering Mystery