@book{Petrova-1967,
  address    = {Leningrad},
  author     = {Petrova, Taisija Ivanovna},
  publisher  = {Nauka},
  title      = {Jazyk orokov (ul'ta)},
  year       = {1967},
  iso_code   = {oaa},
  olac_field = {semantics; general_linguistics; typology; syntax},
  wals_code  = {ork}
}