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Festinger, Leon (June 1946). "The significance of difference between means without reference to the frequency distribution function". Psychometrika. 11 (2): 97–105. doi:10.1007/BF02288926. PMID20986724.
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Bem, D. J. (1967). "Self-perception: An alternative interpretation of cognitive dissonance phenomena". Psychological Review. 74 (3): 183–200. doi:10.1037/h0024835. PMID5342882– via APA PsycNet.
Festinger, Leon (June 1946). "The significance of difference between means without reference to the frequency distribution function". Psychometrika. 11 (2): 97–105. doi:10.1007/BF02288926. PMID20986724.