1. Baumann, K. (2003). Persönliche Erfüllung im Dienen? Motivations- und identitätspsychologische Überlegungen zum beruflichen engagement in helfenden Berufen [Personal fulfillment in service? Motivational and identity-psychological reflections on professional engagement in helping professions]. Zeitschrift für medizinische Ethik, 49, 29–42.
2. Büssing, A., Matthiessen, P. F., & Ostermann, T. (2005). Engagement of patients in religious and spiritual practices: Confirmatory results with the SpREUK-P 1.1 questionnaire as a tool of quality of life research. Health and Quality of Life Outcomes, 3(53).
http://www.hqlo.biomedcentral.com/articles/10.1186/1477-7525-3-53
.
3. Büssing, A., Fischer, J., Haller, A., Ostermann, T., & Matthiessen, P. F. (2009). Validation of the brief multidimensional life satisfaction scale in patients with chronic diseases. European Journal of Medical Research, 14, 171–177.
4. Büssing, A., Föller-Mancini, A., Gidley, J., & Heusser, P. (2010). Aspects of spirituality in adolescents. International Journal of Children’s Spirituality, 15, 25–44.
https://doi.org/10.1080/1364436X.2013.849661
.
5. Büssing, A., Reiser, F., Michalsen, A., & Baumann, K. (2012). Engagement of patients with chronic diseases in spiritual and secular forms of practice: Results with the shortened SpREUK-P SF17 questionnaire. Integrative Medicine: A Clinician’s Journal, 11, 28–38.