Arist von Schlippe and Jochen Schweitzer, Lehrbuch der Systemischen Therapie und Beratung (Göttingen: Vandenhoeck & Ruprecht) 1998, pp 245-261.
For the field of family medicine see also Susan H. McDaniel, et al. Medical Family Therapy: A Biopychosocial Approach to Families with Health Problems (New York: Basic Books) 1992 pp 26-35