@book{Bates-1904,
  address    = {London},
  author     = {Bates, George L.},
  publisher  = {Richard Clay and Sons},
  title      = {Handbook of Bulu},
  year       = {1904},
  iso_code   = {bum},
  olac_field = {general_linguistics; syntax; typology},
  wals_code  = {buw}
}