@book{Esser-1964,
  address    = {'s-Gravenhage},
  author     = {Esser, Samuel J.},
  publisher  = {M. Nijhoff},
  title      = {De Uma-Taal (West Midden-Celebes) Spraakkunstige Schets en Teksten},
  year       = {1964},
  iso_code   = {ppk},
  olac_field = {general_linguistics; phonetics; syntax; typology; phonology},
  wals_code  = {uma}
}