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3. United States: Racial resentment, negative partisanship, and polarization in Trump’s America;Abramowitz;Annals of the American Academy of Political and Social Science,2019
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5. APCO Worldwide, 2018, Corporate advocacy in five acts. Retrieved March 4 from 〈https://www.apcoworldwide.com/docs/default-source/default-document-library/Thought-Leadership/apcos-five-acts-of-corporate-advocacy.pdf〉.