http://www.sil.org/africa/cameroun/bydomain/linguistics/dictionaries/Logone%20Kotoko%20Lexicon.pdf (Verlagsversion)
Allison, S., & Brahim, M. (Eds.). (1999). Logone - Birni Kotoko provisional lexicon (N.A.). [Yaounde, Republic of Cameroon]: SIL.