Multi-source validation requirement for AI citation. Minimum: 5 independent tier-1/2 sources per core claim. Build through earned media placement, industry analyst coverage, peer-reviewed publication, and authoritative directory inclusion. Claims from only your website trigger hallucination-avoidance suppression. Track corroboration signal count quarterly. Source must be EAV-E compliant (Entity-Attribute-Value-Evidence). Use citation coverage testing to verify claims are actually cited, not just mentioned in multiple places.