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In principle, Wikibooks discourages original research. In practice, however, Wikibooks allows material based on repeatable information from personal experiences or from <a class="mw-selflink-fragment" href="#Common_knowledge">common knowledge</a> when published literature might reasonably support it, or <a href="/wiki/Wikibooks:Decision_making" title="Wikibooks:Decision making">consensus</a> might reasonably agree with its inclusion. If questions <i>do</i> arise, questionable material must cite a reliable publication to be kept. </p><p>Textbooks are typically, but not always, tertiary sources that draw on previously published reviews and syntheses for their content. On the other hand, referring to external sources may sometimes be unnecessary or impractical, such as for recipes in a cookbook. 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