B&S

Boas, Franz & J. Swanton. 1911. Siouan (Dakota).

@None{boasandswanton,
  author = {Boas, Franz and Swanton, J. },
  title  = { Siouan (Dakota).},
  year   = {1911}
}
@None{boasandswanton,
  author = {Boas, Franz and Swanton, J. },
  title  = { Siouan (Dakota).},
  year   = {1911}
}
@None{boasandswanton,
  author = {Boas, Franz and Swanton, J. },
  title  = { Siouan (Dakota).},
  year   = {1911}
}