I have started to develope a policy of adding media files to all source citations.
This is normally attached to the citation but in some examples I have to attach it to the master source.
The media is generally a pdf print off of the sources, for example, if I see a website that gives me information them I print the page to pdf format, save it and link the media to the source.
When Im not able to get an image I attach a jpg that is simply a white square with a black border and in a red font the words "No Omage available", so that at least something is attached.
Is there an easy way I can go through my sources and tell which ones do not have media attached?