- what the heck is it originally: here I want to see the author's name, date, original place of publication etc. if it's a document. For an image, I want artist, date, venue it first appeared in if commercial art etc. Anything that helps me understand the context of the original piece needs to be represented.
- where did you find it: here you can give me a website if you have a clickable link. But remember not every URL is clickable. Make sure you are using a stable URL.
- if it also exists as a print source in a collection or database, I need that knowledge too. If you found it in ABC-CLIO, or JSTOR, or the Metropolitan Museum of Art, I might want to search it myself. Because the first rule of finding stuff in research is that where you found one thing, you will probably find more. Using other people's footnotes and bibliographies is pretty much a junior-senior year of college thing. But it doesn't hurt my students to make them aware of this practice for later. Sometimes, they even get to use it now.
PS. Don't even get me started on e-texts that don't have clickable footnotes/endnotes that pop up next to the notation when you click on it. What's the point of having a digital text if not to make things easier for readers? Yet does anybody do this? Anyone?