https://canvass50.com/wp-content/uploads/2021/09/Maricopa-County-Canvass-Report-Final-090721.pdf

Why Do Most Countries Ban Mail-In Ballots?: They Have Seen Massive Vote Fraud Problems

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3666259

Building Confidence in U.S. Elections

REPORT OF THE COMMISSION ON FEDERAL ELECTION REFORM

https://moritzlaw.osu.edu/electionlaw/litigation/documents/Veasey7848.pdf