Reference: Andersen 1993

Andersen, Torben. 1993. Verbal roots and verbal inflection in Berta. African Languages and Cultures 6(2). 97–119. Taylor & Francis.

@article{andersen1993berta,
  author    = {Andersen, Torben},
  journal   = {African Languages and Cultures},
  number    = {2},
  pages     = {97–119},
  publisher = {Taylor & Francis},
  title     = {Verbal roots and verbal inflection in Berta},
  volume    = {6},
  year      = {1993}
}