Proof of Heaven: A Neurosurgeon's Journey into the Afterlife - Eben Alexander, M.D.
Life After Life (1975) - Raymond Moody, M.D. - The classic early exploration of near death experiences. Also: Coming Back: A Psychiatrist explores Past Life Journeys (1991), Glimpses of Eternity (2011) and many more.
The Afterlife of Billy Fingers - Annie Kagan
Saved By the Light: True Story of a Man Who Died Twice - Dannion Brinkley with Paul Perry
My Son & the Afterlife - Elisa Medhus MD
What Thousands of Near Death Experiences Can Teach us about Dying - article