More or less short and simple, what is the status of a ruling on a nation being mentioned in a factbook of another player with, or without link. However against the nation of mention's consent in being mentioned or referred.
It might be a problem, but we need to see specifically what they wrote to make a definite ruling.
If you can't talk it out among yourselves, send a GHR with a link to the offending factbook and point out what was used without permission.
Don't take life so serious... it isn't permanent... RIP Dyakovo and Ashmoria 19th century steamships may be harmful or fatal if swallowed. In case of accidental ingestion, please seek immediate medical assistance. ༄༅། །འགྲོ་བ་མི་རིགས་ག་ར་དབང་ཆ་འདྲ་མཉམ་འབད་སྒྱེཝ་ལས་ག་ར་གིས་གཅིག་གིས་གཅིག་ལུ་སྤུན་ཆའི་དམ་ཚིག་བསྟན་དགོས།