In my posts I prefer to post reference material and links if possible to sources. Is this not necessary or does that make for a more proper answer?
Unless you're Jon Skeet (which is The Source©) it is always better to include references to official documentation, extensive blog-posts, articles, videos or training material because it enables others
- to verify the correctness of your answer
- to gain more in-depth or wider knowledge about the orginal problem
- to learn where to look the next time if anyone encounters a similar problem
By adding the sources you used to be able to answer the question teaches the OP and the visitors of the question how to fish which is a better survival technique than just handing over the prepared fish-and-chips.
Answers that teaches how to fish deserves upvotes.