There are two types of links for ancestry. A direct link to the page will only work if you have a subscription, a share-image can be seen by anyone.
With that being said, not all records on ancestry have images and if there is not an image, I link to the page because image sharing would be blank and IMHO, quite useless.
In the case of Nancy Marshall, all of the sources seem to be images, so you should be able to view them.