@book{Schadeberg-1990,
  address    = {Köln},
  author     = {Schadeberg, Thilo C.},
  publisher  = {Köppe Verlag},
  series     = {Grammatische Analysen afrikanischer Sprachen},
  title      = {A Sketch of Umbundu},
  volume     = {1},
  year       = {1990},
  iso_code   = {umb},
  olac_field = {typology; general_linguistics; phonology; phonetics},
  wals_code  = {umb}
}