There is an interesting book by Craig Mitchell, an Australian ambulance officer. As an ambulance officer he worked to resuscitate people, and over the years he gathered stories from many survivors, some of who had "near death experiences". His book tells many of the first hand accounts of those people who died, were resuscitated, and had an account of an other world experience. It's out of print now but sometimes comes up on ebay etc.

NEAR DEATH STORIES FROM THE OTHER SIDE published by Mandarin 1996