http://www.sil.org/africa/cameroun/bydomain/linguistics/dictionaries/Ngomba%20Provisional%20Lexicon.pdf (Publisher version)
Kouhegnou, L., & Satre, S. (2003). Ngomba provisional lexicon: Date - updated May 13, 2003 (N.A.). [Yaounde, Republic of Cameroon]: [SIL].