1. American Psychological Association (1997). Professional code of ethics for psychologists. Washington, DC: American Psychological Association.
2. & (1991). The origins of happiness. In & (Eds), Subjective well-being (pp. 77-104). Oxford: Pergamon.
3. (1989). Das Trierer personlichkeitsinventor. Gottingen: Hogrefe.
4. Values and personality
5. & (1993). Facet theory: The method and its application. Newbury Park, CA: Sage.