Ruediger Dahlke, a doctor and psychotherapist since 1979, is the author of over sixty books. Thorwald Dethlefsenwas a German psychologist, an esotericist, and the author of several books, who died in 2010.

• Illness & Symptoms; Polarity & Unity; The Shadow; Good & Evil; Illness is in Our Nature; The Search for Causes; The Technique of In-depth Enquiry; Infection; Resistance: Respiration; Digestion; The Sense Organs; Headaches; the Skin; The Kidneys; Sexuality & Pregnancy; The Heart & Circulation; The Motor System & Nerves; Accidents; Psychological Symptoms; Cancer; AIDS; What to Do.