Combs, David J.Y.; Powell, Caitlin A.J.; Schurtz, David Ryan; Smith, Richard H. Politics, schadenfreude, and ingroup identification: The sometimes happy thing about a poor economy and death. Journal of Experimental Social Psychology. July 2009, 45 (4): 635–646. ISSN 0022-1031. doi:10.1016/j.jesp.2009.02.009.
Combs, David J.Y.; Powell, Caitlin A.J.; Schurtz, David Ryan; Smith, Richard H. Politics, schadenfreude, and ingroup identification: The sometimes happy thing about a poor economy and death. Journal of Experimental Social Psychology. July 2009, 45 (4): 635–646. ISSN 0022-1031. doi:10.1016/j.jesp.2009.02.009.