Links in Reports

Hello,
I am curious who puts links in their reports for the clients to do additional research on their own. What links do you use to refer them to?
I have not done this yet, but I am considering to doing this with my reports. Some of the possible links (I would have to look into the actual address) that I can think of are:
Federal Pacific Panels
Sylvania Panels
CSST Safety
Zonolite Insulation (Class action lawsuit)

I regularly include links. Others include pool barrier safety, some brands of PEX. Sometimes I see water heaters, etc. installed incorrectly and I might include a link to the installation instructions.