Cakal، H.؛ Hewstone، M.؛ Schwär، G.؛ Heath، A. (2011). "An investigation of the social identity model of collective action and the 'sedative' effect of intergroup contact among Black and White students in South Africa". British Journal of Social Psychology. ج. 50 ع. 4: 606–627. DOI:10.1111/j.2044-8309.2011.02075.x. PMID:22122025.
Cakal، H.؛ Hewstone، M.؛ Schwär، G.؛ Heath، A. (2011). "An investigation of the social identity model of collective action and the 'sedative' effect of intergroup contact among Black and White students in South Africa". British Journal of Social Psychology. ج. 50 ع. 4: 606–627. DOI:10.1111/j.2044-8309.2011.02075.x. PMID:22122025.