Cite your sources: back up the numbers on your website

Key takeaways

Citing sources on a business website makes claims checkable, and checkable claims are more credible. The first Stanford guideline for web credibility is to make it easy to verify the accuracy of the site. Name the source and year for every statistic, link to the original, and label your own data clearly as yours.

• Name the source and year for every statistic.
• Link to the original source, not a blog that quoted it.
• Label your own data, such as 'across our client work'.
• Sourced content is easier for search engines and AI tools to trust.

Why does citing sources build credibility?

Citing sources builds credibility because it lets visitors check you, and the willingness to be checked signals honesty. The Stanford guidelines put verifiable accuracy first. Google's guidance on helpful content asks whether content is supported by clear sourcing and evidence of expertise. Unsourced statistics invite doubt, especially round numbers that sound invented.

• How website design influences brand credibility
• The Stanford web credibility guidelines, applied today

What should you cite?

Cite anything a sceptical buyer might question.

• Market statistics and industry figures.
• Laws, regulations and official guidance.
• Research findings you use to explain your approach.
• Price ranges, with where they come from.
• Your own results, with how they were measured.

• Website claims and the CAP Code: what UK firms can say
• Website credibility statistics, with sources

How do you cite sources on a business site?

Keep it light. In the sentence, name the source and year, such as 'Office for National Statistics, 2025', and link to the original page. For articles, add a short 'Sources' list at the end. Prefer primary sources: government, regulators, standards bodies and original research, rather than other blogs.

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How does sourcing help with AI search?

AI tools that summarise the web, such as Google's AI Overviews, tend to draw on content that is specific, factual and well supported. Clear statements with named sources are easier to quote accurately. Your own clearly labelled data, such as aggregated client results, is especially valuable because nobody else has it.

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• How to get your website cited in AI search

When is citing overkill?

You do not need to cite common knowledge or your own descriptions of your services. Over-citing short sales pages can make them feel academic. Save formal sourcing for statistics, legal points and articles, and keep service pages to plain claims you can prove on request.

• Why specific claims convert better than adjectives

What does this look like in practice?

A pattern we see: a blog post claims '88% of customers check reviews' with no source. A reader cannot verify it and the original study, if it exists, is a decade old. Replacing it with a current, linked figure, or removing it, makes the whole article more believable.

• See client work
• Website Design & Development for UK businesses

Source citing checklist

• List every statistic on your key pages.
• Find the original source and year for each.
• Replace or remove any you cannot trace.
• Link to primary sources.
• Label your own data clearly.

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Next step

Pick your three most-visited articles and check every number in them has a named, linked source.