"This work is licensed under a Creative Commons Attribution 3.0 unported license. Some images under CC BY-SA."
This isn't sufficient
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
<p> This work is licensed under a <a>Creative Commons Attribution 3.0</a> unported license. Some images under <a>CC BY-SA</a>. </p>
The links to the licenses don't work either
Other pages such as https://wikimediafoundation.org/ do have "Photo credits", but no links to the licenses either. Some images aren't credited or linked or licensed