Reliable sources

Evaluate sources by independence, editorial control, expertise, publication history, and whether the source directly supports the claim.

Prefer official records, recognized publishers, peer-reviewed research, established news organizations, institutional publications, and authoritative databases. First-party sources may support limited routine facts but should not be the sole basis for disputed, promotional, medical, legal, financial, or reputational claims.

Affiliate pages, scraped content, anonymous blogs, paid placements, copied biographies, content farms, and commercial ranking pages should not establish notability or support important claims.