<p>About <a href="https://stats.stackexchange.com/questions/tagged/references" class="post-tag" title="show questions tagged &#39;references&#39;" rel="tag">references</a>:</p>

<p>I included a link to the most upvoted answer in <a href="https://stats.meta.stackexchange.com/questions/1593/should-all-book-recommendation-questions-be-classified-as-community-wiki/1595#1595">Should all &quot;book recommendation&quot; questions be classified as community wiki?</a> in the tag wiki as additional guidance.</p>

<p>@amoeba edited the tag excerpt to also advise using specific tags:</p>

<blockquote>
  <p>Questions seeking external references (books, papers, etc.) about a particular subject. Always use a more specific tag in addition.</p>
</blockquote>

<p>About the general question:</p>

<blockquote>
  <p>Should we have usage guidelines for meta-tags?</p>
</blockquote>

<p>Generally speaking, meta tags should be avoided, but sometimes the community decides there can be exceptions, such as <a href="https://stats.stackexchange.com/questions/tagged/self-study" class="post-tag" title="show questions tagged &#39;self-study&#39;" rel="tag">self-study</a>. In such cases, it is always good to have guidance about using these tags.</p>
