- Are California voters about to impose the world’s first ‘billionaires tax’? BBC
- The millions spent by California billionaires against Proposition 40 represent about 0.07% of their wealth. Los Angeles Times
- California Prop 40: What you need to know about billionaires’ wealth tax Yahoo Finance
- Dave Regan pushed hard for the billionaire tax. He now faces a union investigation. The New York Times
- Reviews | Why the fate of California’s wealth tax could be decided well after the election CalMatters
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