Hi a warm welcome to the site.
This criteria explores two possibilities, one. the sources within your setting and two. sources outside of your setting.
Who would you speak to or contact in your setting if you had concerns about a child's behaviour? key person, manager, supervisor, SENCO, behavior support
Where would you go to research or gather information relating to behaviour you found concerning? -
BEST
Depending on the course title and recommended textbook there is infomation about sources on page of
272 of this level 3 handbook
Hope this helps