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Referendum - Wikipedia
Initiatives and referendums in the United States - Wikipedia
Referendums by country - Wikipedia
Referendum - Ballotpedia
Referendum and initiative | Definition, Forms, History, & Facts
Referendum Definition & Meaning - Merriam-Webster
Simple Civics | What is a Referendum? | PBS
Referendum | Encyclopedia.com
States with initiative or referendum - Ballotpedia
Summary of Constitutional Amendments and Statewide …