::::There is the portion of the WP:V policy, which Appleby seems to overlook.  Everybody, please read Wikipedia:Reliable sources#Advice specific to subject area under the section "History" with extreme caution.  In particular, there is a passage which reads: 
 ::::*General encyclopedia like recent editions of the Encyclopedia Britannica or Encarta sometimes have authoritative signed articles written by specialists and including references. Be warned that most unsigned entries are written in batches by freelancers with little expertise and must be used with caution. 
 ::::In other words, Britannica may be unreliable at times.  Please let it be noted that many other editors here question Appleby's interpretations of Britannica and some of his other sources.  Wikipedia is not a medium for misinformation, and the other editors here demand accuracy in all Manchuria-related article, including this one (Bohai/Balhae).  Appleby cannot be allowed to make edits which blatantly contradict information on the authoritative primary sources such as the "Old Book of Tang" (945) and the "New Book of Tang" (1061). 
 ::::