@misc{3187,
  author = {Hamm, Cameron D.},
  title  = {A Sociolinguistic Survey of the Gvoko and Guduf Languages of Cameroon and Nigeria (Rapid Appraisal). Ms.; Wolff, Ekkehard. (1971) Die sprachliche Situation im Gwoza-Distrikt (Nordostnigerias). Journal of African Languages 10(1). 61-74.},
  year   = {2000}
}