Vase, L., Jonas, W. B. & Walach, H. (2011). Placebo, meaning and context issues in research. In G. T. Lewith, W. B. Jonas & H. Walach (Eds.), Clinical Research in Complementary Therapies: Principles, Problems and Solutions (2 ed., pp. 313-331). Churchill Livingstone.
Hem, L. (2011). Psykologisk teori og praksis. In B. Karpatschof & B. Katzenelson (Eds.), Klassisk og moderne psykologisk teori (2. ed., pp. 707-723). Hans Reitzels Forlag.