@incollection{sStevensonTira,
  author    = {Stevenson, Roland C.},
  booktitle = {Tira and Otoro: Two Kordofanian grammars},
  editor    = {Schadeberg, Thilo C.},
  pages     = {1-114},
  publisher = {Cologne: Rüdiger Köppe Verlag},
  series    = {Archiv afrikanistischer Manuskripte},
  title     = {A grammar of Tira},
  volume    = {8},
  year      = {2009}
}