| voterguide.sos.ca.gov/propositions/40/analysis.htm | — | government |
| lao.ca.gov/BallotAnalysis/Proposition | — | government |
| voterguide.sos.ca.gov/propositions/40/title-summary.htm | — | government |
| sos.ca.gov/campaign-lobbying/helpful-resources/measure-contributions/2026-ballot-measure-contribution-totals/proposition-40-imposes-one-time-tax-certain-individuals-and-trusts-initiative-constitutional-amendment-and-statute | — | government |
| voterguide.sos.ca.gov/propositions/40/arguments-rebuttals.htm | — | government |