National Geographic Style Manual
Interesting to see what NatGeo considers politically correct these days…
You can find their Here
Here's an example:
Malay, Malayan, Malaysian REVISED
Malay (noun and adjective): refers to Malay peoples, the Malays, and their language.
Malaysian (noun and adjective): refers to the nation of Malaysia.
Malayan (noun and adjective): refers to Malay Peninsula or its various peoples, although today, because of its association with colonial times, it is being replaced with Malay.