@incollection{Butt89,
  author	= {Butt, David. G.},
  editor	= {Hasan, Ruqaiya and Martin, James R.},
  year		= {1989},
  title		= {The object of language},
  booktitle	= {Language development: learning language, learning culture (Meaning and choice in language: studies for Michael Halliday)},
  publisher	= {Ablex},
  address	= {Norwood, N.J.}
}