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Book chapters

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Vollhardt, J.R. (2014). The question of legitimacy in studying collective trauma. In I. Maček (Ed.), Engaging violence: trauma, memory, and representation (pp. 74-90). New York, NY: Routledge. 

Vollhardt, J. R. (2012). Collective victimization. In L. Tropp (Ed.), Oxford handbook of intergroup conflict (pp. 136-157). New York, NY: Oxford University Press.

Bilewicz, M., & Vollhardt, J. R. (2012). Evil transformations: Psychological processes underlying genocide and mass killing. In A. Golec De Zavala & A. Cichocka (Eds.), Social psychology of social problems. The intergroup context (pp.  280 - 307). New York, NY: Palgrave Macmillan.

Groeben, N., & Vollhardt, J.R. (2012). Friedenspsychologie als zielorientierte Praxisforschung. Eine metatheoretisch-methodologische Kritik. In J. Rost & W. Baros (Eds.), Natur- und kulturwissenschaftliche Perspektiven in der Psychologie. Methodologie - Methoden - Anwendungsbeispiele (pp. 17 - 27). Berlin, Germany: Regener Verlag.

Vollhardt, J. R. (2012). Collective victimhood. In D. J. Christie (Ed.), Encyclopedia of Peace Psychology (pp. 1164-1167). Hoboken, NJ: Wiley-Blackwell.

Vollhardt, J. R. (2012). Social psychological peace research. In D. J. Christie (Ed.), Encyclopedia of Peace Psychology (pp. 1037 - 1041). Hoboken, NJ: Wiley-Blackwell.

Vollhardt, J. R. (2012). Tolerance for diverse groups. In D. J. Christie (Ed.), Encyclopedia of Peace Psychology (pp. 1117-1121). Hoboken, NJ: Wiley-Blackwell.

Shapiro, I., Bilali, R., & Vollhardt, J. (2009). Peace. In S. J. Lopez (Ed.), The encyclopedia of positive psychology, Vol. 2 (pp. 672-676). Oxford, UK: Wiley-Blackwell.

Vollhardt, J., & Migacheva, K., & Tropp, L. (2008). Social cohesion and tolerance for group differences. In J. de Rivera (Ed.), Handbook on building cultures of peace (pp. 139-152). Berlin, New York: Springer.

Vollhardt, J. (2004). Der Einfluss des Faktors Geschlecht auf die Filmpräferenz [The influence of gender on the preference of film genres]. In B. Boeckle & M. Ruf (Eds.), Eine Frage des Geschlechts. Ein Gender-Reader [The question of gender. A gender reader]. (pp. 207-219). Wiesbaden, Germany: Verlag für Sozialwissenschaften.