@book{Ittmann-1939,
  address    = {Berlin},
  author     = {Ittmann, Johannes},
  publisher  = {Reimer},
  title      = {Grammatik des Duala},
  year       = {1939},
  iso_code   = {dua},
  olac_field = {typology; syntax; general_linguistics},
  wals_code  = {dua}
}