Wikipedia:Citation needed
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From 
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Example: Most people believe in ghosts.[citation needed]
To ensure that all Wikipedia content is verifiable, anyone may question an uncited claim by inserting {{citation needed}} or a similar inline template.
- If you can locate a reliable source for the claim: Please be bold and substitute
<ref>a footnote to the source</ref>. Leave the copyediting to someone else, or learn more at Wikipedia:Citing sources and Wikipedia:Citation templates. - Exercise caution when relying upon unsourced claims. If you have reason to think that the claim is inaccurate, you may remove it from the article altogether, paste it into the article's talk page, and state your reasoning there.
- Controversial, poorly sourced claims in biographies of living persons should be deleted immediately.
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