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Meier, Laurenz; Orth, Ulrich; Denissen, Jaap J. A.; Kühnel, Anja (2011). Age differences in instability, contingency, and level of self-esteem across the life span. Journal of Research in Personality, 45(6), pp. 604-612. Elsevier 10.1016/j.jrp.2011.08.008
