Combs, David J.Y.; Powell, Caitlin A.J.; Schurtz, David Ryan; Smith, Richard H. (July 2009). Politics, schadenfreude, and ingroup identification: The sometimes happy thing about a poor economy and death. Journal of Experimental Social Psychology. 45 (4): 635—646. doi:10.1016/j.jesp.2009.02.009. ISSN0022-1031.
Combs, David J.Y.; Powell, Caitlin A.J.; Schurtz, David Ryan; Smith, Richard H. (July 2009). Politics, schadenfreude, and ingroup identification: The sometimes happy thing about a poor economy and death. Journal of Experimental Social Psychology. 45 (4): 635—646. doi:10.1016/j.jesp.2009.02.009. ISSN0022-1031.