Kruglanski, A.W., Shah, J.Y., Fishbach, A., Friedman, R., Chun, Woo.Y., Sleeth-Keppler, D. (2002). "A theory of goal systems". Advances in Experimental Social Psychology. 34: 331–378. doi:10.1016/S0065-2601(02)80008-9. ISBN9780120152346.{{cite journal}}: CS1 maint: multiple names: authors list (link)