Charts, graphs and inventories are compilations of someone's work designed for ease of reader access. It is particularly important to give credit for this type of content because it tends to be very unique.
WAer's have permission to use this kind of information, developed by WA. The individual affiliate number, at the end of the url, confirms this permission. But if someone captured a WA graphic or chart without being an affiliate member, they would have to give proper credit.
Here is an example of citing a list.
The chart below lists the primary symptoms of dry mouth.
diagnosissjogrens.com, (James Collins, 2016, "Dry Mouth- Sjogren Syndrome - Chronic Irritation)
A chart or graph, like this example, is credited by listing the source title, the author, date, and page or article in parentheses.
How do you give credit to a newspaper or journal?