American Society for Psychical Research (ASPR): Exceptional Experiences and Near-Death Experiences Questionnaire
<http://www.aspr.com/question.htm>
How Stuff Works: How Near-Death Experiences Work
<http://science.howstuffworks.com/science-vs-myth/extrasensory-perceptions/near-death-experience.htm>
The Skeptic’s Dictionary: Out-of-Body Experience (OBE)