Friesen, L. (2002). Valence change and Oroko verb morphology (Mbonge dialect). Master Thesis, Univ. of North Dakota, Grand Forks, ND. [PuRe Item] 
bdu – Oroko
The noun class system of Oroko east
Shu, A. C. (1993). The noun class system of Oroko east. Master Thesis, Université de Yaoundé, Yaoundé. [PuRe Item]
The phonology of Lukundu (Bakundu)
Atta, S. E. (1993). The phonology of Lukundu (Bakundu). Master Thesis, Université de Yaoundé. [PuRe Item]