Ring, Kenneth. The Impact of Near-Death Experiences on Persons Who Have Not Had Them: A Report of a Preliminary Study and Two Replications, article, Summer 1995; (https://digital.library.unt.edu/ark:/67531/metadc799331/m1/1/: accessed June 13, 2021), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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