Hiding attribution of quoted material

I recently came across a suggested edit which I found questionable. Most of the edit was good, so it was finally approved.

However, one part of the post, similar to this:

Quoted material from external site
...

http://website.example/link/to/blog

was changed to:

Quoted material from external site
...

Source

Thus effectively hiding the link behind the word "Source".

Since the content is quoted from an external site, I think that the link should have been kept as it was, or at the very least, that the name of the website should be clearly visible, as in:

Source: Website.example

I'm looking for opinions or references to official guidelines on this matter. My view is that this part of the edit was completely inappropriate.

_{Note: I specifically did not tag this with suggested-edits because my question is more about the appropriateness of attribution, than guidance for reviewing suggested edits.}