1. Ethno Therapy, Music and Trance: an EEG investigation into a sound-trance induction;Fachner,2011
2. Music psychotherapy with archaic sound sources: an innovative method for treating so-called early disturbances;Hess;Musiktherapeutische Umschau: Forschung und Praxis der Musiktherapie [Germany],1999
3. http://www.musictherapyworld.net/.
4. P. Hess, 2008. Singing Bowls for Health and Inner Harmony. In: Peter Hess (Ed.) Germany
5. L. Pigaiani, 2014. Bagno Armonico. Massaggio sonoro con Campane Tibetane. Fontana Editore.