Links to Sources: Backing Up Claims with Citations
Why linking to external sources makes AI more likely to trust and cite your content.
What it measures
This metric measures how many external links your main content body carries for every 1,000 words: links that cite sources, research, or authoritative references. Links in the navigation and footer do not count.
Why it matters for AI
Outbound citations signal to AI that your content is well-researched and connected to the broader knowledge ecosystem. Pages that cite their sources are seen as more trustworthy and authoritative. When GPTBot or ClaudeBot encounters a claim backed by a link to a published study, it has much higher confidence in citing your page as a source.
| Links per 1,000 words (articles) | Score | AI perception |
|---|---|---|
| Under 0.5 | 1–3 (Poor) | Claims appear unsupported |
| 0.5–2 | 3–7 (Average) | Some evidence, but could be stronger |
| 2 or more | 7–10 (Good) | Well-researched, trustworthy |
Pages that are not articles, such as product and landing pages, are held to a lower bar: no links scores 3, and about 5 per 1,000 words scores 7.
How to improve
- Link to original sources — When citing statistics, link to the actual study or report
- Reference published research — Academic papers, industry reports, and official documentation add authority
- Cite authoritative industry sources — Link to recognised organisations and well-known publications
💡 Quick win
For every statistic or claim in your article, add a hyperlink to the original source.