I can't actually see the source at that link, but that is the problem I have found with ALL pages on italiangen.org. Please see my father's profile for an example of how I cite sources at italiangen. Please not that the link takes you only to their search page - you would have to put in the name to see the page with the record, and even then, you still have to select the right record to see. I captured the screen, then cropped it to make a graphic of only the data I wanted and uploaded that to WikiTree. This way, my citation includes all information found and has a link so that people can go find it themselves if they want to.
EDITED TO ADD: I just went back to your link to look some more and I see where someone posted an image, but I don't see the image - instead, I see a notice that says "You do not have the required permissions to view the files attached to this post." Apparently one would have to have an account there to be able to see it.
You could right-click on an image to get a popup menu that includes the option to save the image to your computer. That probably won't help, though, because unless you are sure that the image is in the public domain, you don't have the right to upload it to WikiTree ... but at least you would have a copy of it on your computer.