@incollection{Turner87,
  author	= {Turner, Geoffrey J.},
  editor	= {Halliday and Fawcett},
  year		= {1987},
  title		= {Sociosemantic networks and discourse structure},
  booktitle	= {New developments in Systemic Lingustics},
  publisher	= {Frances Pinter},
  address	= {London}
}