Carlos S. Alvarado: Neglected Near-Death Phenomena. Lawrence, Kansas. UNT Digital Library; http://digital.library.unt.edu/ark:/67531/metadc799130 Edmund Parish 1897: Hallucinations and illusions : a study of the fallacies of perception. Engelsk utgave. Innskannet på https://archive.org/stream/hallucinationsil1897pari/hallucinationsil1897pari_djvu.txt.