1. Bollens PA, Reeves RR, Replogle WH, Koenig H (2009) A randomized trial on the effect of prayer on depression and anxiety. Int J Psychiatry Med 39(4):377–392
2. Heitel M (2007) Die heilenden klänge der mantras. Südwest, München (The Healing Sounds of Mantras. 2016, Smirti, Salt Lake City) Own translation
3. Meichenbaum DH (2008) Trauma, spirituality, and recovery: toward a spiritually-integrated psychotherapy. Paper. https://melissainstitute.org/scientific-articles-by-author/. Accessed 10 July 2020
4. Porges SW (2018) Die Polyvagal-Theorie und die Suche nach Sicherheit. Traumabehandlung, soziales Engagement und Bindung. G. P. Probst, Lichtenau/Westfalen
5. PTSD: National Center for PTSD (2020) Spirituality and trauma: professionals working together. https://www.ptsd.va.gov/professional/treat/care/spirituality_trauma.asp. Accessed 10 July 2020