user9943: There has been a barrage of tag wiki edits by a user today and although they looked good when reviewing them, it made me wonder if it would be a good idea to mention the sources when constructing a tag description or tag wiki?  
I must admit beforehand I did not mention my sources when making my first tag descriptions or even wikis, but of late I have been doing this, e.g. when I made the signal-processing tag description.
Would it be good to urge users to add their sources or is this unnecessary? Personally, being a big fan of adding my sources, I would opt to start asking users to do it.  

user9943: Given the careful feedback of @fileunderwater I wish to share my conclusion here that links to sources in tag descriptions and wikis should be considered  as optional, and not as a mandatory component. 
Again, and perhaps personally, I am a big supporter of mentioning sources, but I agree with fileunderwater that it may be a bit of an overkill in some cases.

user3624: A short reaction; I'm bit hesitant. To me, tag wikis are short pointers to describe how tags should be used, and not a full introduction to a subject. For that we have textbooks, reviews, Wikipedia and other websites. While links or single refs in tag wikis might serve a purpose in very specific cases I see them as overkill and unnecessary clutter in general. I don't see the point of e.g. generally linking to Wikipedia pages. If people are interested in a subject they will probably search in Wikipedia either way. Also, tag wikis are looked at and edited seldomly, which means that there is a high probability that dead links will go unnoticed.

9943: <p>There has been a barrage of tag wiki edits by a user today and although they looked good when reviewing them, it made me wonder if it would be a good idea to mention the sources when constructing a tag description or tag wiki?  </p>

<p>I must admit beforehand I did not mention my sources when making my first tag descriptions or even wikis, but of late I have been doing this, <em>e.g.</em> when I made the <a href="https://biology.stackexchange.com/tags/signal-processing/info">signal-processing</a> tag description.</p>

<p><strong>Would it be good to urge users to add their sources or is this unnecessary?</strong> Personally, being a big fan of adding my sources, I would opt to start asking users to do it.  </p>
 9943: <p>Given the careful feedback of @fileunderwater I wish to share my conclusion here that <strong>links to sources in tag descriptions and wikis should be considered  as optional</strong>, and not as a mandatory component. </p>

<p>Again, and perhaps personally, I am a big supporter of mentioning sources, but I agree with fileunderwater that it may be a bit of an overkill in some cases.</p>
 3624: <p>A short reaction; I'm bit hesitant. To me, tag wikis are short pointers to describe how tags should be used, and not a full introduction to a subject. For that we have textbooks, reviews, Wikipedia and other websites. While links or single refs in tag wikis might serve a purpose in very specific cases I see them as overkill and unnecessary clutter in general. I don't see the point of e.g. generally linking to Wikipedia pages. If people are interested in a subject they will probably search in Wikipedia either way. Also, tag wikis are looked at and edited seldomly, which means that there is a high probability that dead links will go unnoticed.</p>
