Here is a screenshot of the new rules for AdSense referrals

AdSense has indicated that it is OK for account holder to draw attention to the referral buttons or links. As I am going to do just that, and in case I run into trouble with AdSense regarding that, and that webpage that displayed the announcement goes offline, I am attaching a screenshot of that page so that I can refer to it if the occasion arise. I have to rescale the photo to fit the main column width of 340px, but I am going to make it a clickable link so that you can view it more clearly by clicking on the screenshot: