Bridge between the Terrestrial and the Beyond
- Theory and Practice of Transcommunication -
by Hildegard Schaefer (†)

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32.  Authorities used

• Die Parastimme   (The Para voice)
  Informatory periodical of the Forschungsgemeinschaft für Tonbandstimmen (FGT) (association for the research on magnetic-tape voices), Moenchengladbach 
   

• VTF-Post   (VTF mail)
  Informatory periodical of the Verein für Tonbandstimmenforschung (VTF), (association for the research on EVP), Duesseldorf
   

• CETL-Mitteilungen   (CETL messages)
  Informatory periodical of the Cercle d’Études sur la Transcommunication (CETL) (Circle for studies on transcommunication), Hesperange, Luxemburg
   

• INFO
  Informatory periodical of the group Tonbandstimmenforschung Darmstadt (TBSF) (research on EVP)
   

• Bulletin für Parapsychologie (bulletin for parapsychology)
  Schweizerische Vereinigung für Parapsychologie (Swiss association for parapsychology)
   

• Franz Seidl:
  Das Phaenomen der Transzendentalstimmen (Phenomenon of transcendental voices), Frech-Verlag, Stuttgart
   

• Translations from English and Italian into German by Professor Dr. Ernst Senkowski