Datapoint Kikongo-Kituba/Indefinite articles
As far as I know, Kituba and many Bantu languages do not have articles. The fact that mosi can be used in contexts where an indefinite article is used in English is not a sufficient reason for calling it an article. I suppose that typological variation allows this kind of peculiarity.
Values 
Neither indefinite nor definite article
- Example 58-40:
-
mu-ntu mosimu-ntucl1-personmosionea person
- Example 58-41:
-
ba-ntu mosiba-ntupl-personmosionepersons/people
- Confidence:
- Certain