Product Code Database
are important in Wikipedia to ensure that information comes from actual, reliable sources (, ). There are two preferred ways of doing so: footnote and citations. Citations can also be placed as external link, but these are not preferred because they are prone to and usually lack the full information necessary to find the original source in cases of link rot. In cases where citations are lacking, the template {{fact}} can be added after the statement in question.
| Good | Footnotes | Substantiated claim.<ref name="Perry"> Perry's Handbook, Sixth Edition, McGraw-Hill Co., 1984. </ref> Another substantiated claim.<ref name="Perry" /> Substantiated claim from web site.<ref name="example web reference">[http://www.example.org Link text], additional text.</ref> | Substantiated claim. Perry's Handbook, Sixth Edition, McGraw-Hill Co., 1984. Another substantiated claim. Substantiated claim from web site. Link text, additional text. <references/> | ||
| Good | Harvard referencing | Substantiated claim. (Adams 1903) | Substantiated claim. (Adams 1903) | *Adams, Adam. ''The Nomen Dynasty in Eastern Europe'', Academia Press, 1903. ISBN 0000000001 |
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| Bad | Embedded links | Substantiated claim.[http://www.loc.gov] | Substantiated claim.[2] | *[http://www.loc.gov Library of Congress website] | |
| Ugly | Unsubstantiated claim.{{fact}} | Unsubstantiated claim. |
