a.2008, John G. Matsusaka, "Direct Democracy and the Executive Branch", in, 2008, Shaun Bowler and Amihai Glazer, editors, Direct Democracy's Impact on American Political Institutions, Palgrave Macmillan, →ISBN, page 122 [1]:
The second row shows that initiative states fill more constitutional offices by election than noninitiative states, and the difference is statistically significant after controlling for region and population.
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