# Reference / evidence signals

> Evidence signals are the references in a text that back up its claims: links to studies, statistics, named sources and citations.

- **Check ID:** A14
- **Area:** [AI Readiness](https://be1st.ai/glossary/ai-readiness)
- **Tool:** [AI Readiness](https://be1st.ai/tools/ai-readiness)
- **Page:** https://be1st.ai/glossary/ai-readiness/reference-evidence-signals

## Why it matters

AI models evaluate source credibility based on references and evidence. Content backed by verifiable sources has a higher chance of being cited in AI responses.

## In practice

Articles on HubSpot Blog always contain links to research, statistics, and case studies. That's why HubSpot articles are among the most frequently cited sources in AI responses to marketing questions.

## How be1st checks it

Checks for the presence of references, citations, and evidence in the content: external links to studies, statistics with source attribution, expert quotes. One external link, a citation (cite, blockquote) or a phrase such as 'according to' or 'source:' is enough to pass. These signals increase content credibility for AI systems.

[AI Readiness](https://be1st.ai/tools/ai-readiness), Trust tab.

Every check ends as: Pass, Warning, Fail.

## Sources

- [Google Search Essentials](https://developers.google.com/search/docs/essentials) (Google)

## Related terms

- [External links](https://be1st.ai/glossary/seo/external-links): External links point from your page to other websites. Links to trustworthy sources back up the claims in your text and let readers check them.
- [Freshness signals](https://be1st.ai/glossary/ai-readiness/freshness-signals): Freshness signals show when content was published or last updated: a visible date, a `<time>` element or dateModified in structured data.
- [Entity & author completeness](https://be1st.ai/glossary/ai-readiness/entity-author-completeness): Entity and author completeness is how clearly a website says who is behind it: the author, the company, contact details and profiles elsewhere.
- [AI-friendly content formats & feeds](https://be1st.ai/glossary/ai-readiness/ai-friendly-content-formats): AI-friendly formats and feeds are versions of your content made for machines, such as RSS feeds, llms.txt, Markdown pages or a JSON API.
- [Linkability of key facts](https://be1st.ai/glossary/ai-readiness/linkability-of-key-facts): Linkability of key facts means the important parts of a page have their own anchors (#section), so anyone, an AI answer included, can link straight to them.
- [Changelog / release notes](https://be1st.ai/glossary/ai-readiness/changelog-release-notes): A changelog, or release notes, is a dated public list of the changes to a product or website: new features, fixes and removals.