| Please do not add inappropriate external links to books.
External links that you have added have been considered inappropriate by your fellow contributors. Books are intended to be read without the need for external references. Rather than adding external links, particularly those which are for advertising or promotion, please instead expand books to include any missing information. If you feel the external link should be added to a book, please discuss it on the module's talk page rather than re-adding it. See the welcome page to learn more about Wikibooks. Thank you.
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