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              Morrell, M. E. (2003). Survey and experimental evidence for a reliable and valid measure of internal political efficacy. Public Opinion Quarterly, 67(4), 589-602. https://doi.org/10.1086/378965.
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              Morrell, M. E. (2003). Survey and experimental evidence for a reliable and valid measure of internal political efficacy. Public Opinion Quarterly, 67, 589-602.
                 (xsd:string)
              
            
              Morrell, M. E. (2003). Survey and experimental evidence for a reliable and valid measure of internal political efficacy. The Public Opinion Quarterly, 67(4), 589- 602. https://www.jstor.org/stable/3521695.
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