The original <reference/> immediately under the Sources heading was added by a WikiTree member working on this week's challenge who is not a Data Doctor.
It was then erroneously moved by another WikiTree member working on the challenge who is not a Data Doctor.
After this post a Data Doctor moved it back to the correct position.
Not all WT members who work on challenges are badged Data Doctors.
Not everyone who follows the Data Doctors tag are badged members of the Data Doctors Project.
The easiest check to see who made changes is to look at the Changes tab, and then check the WT members' profile and the full badge list to see if they are in fact a Data Doctor.