@incollection{Butler85-discourse,
  author	= {Butler, Christopher S.},
  editor	= {Benson, James D. and Greaves, William S.},
  year		= {1985},
  title		= {Discourse systems and structures and their place within an overall systemic model},
  booktitle	= {Systemic perspectives on discourse: selected theoretical papers from the 9th International Systemic Workshop},
  publisher	= {Ablex},
  address	= {Norwood, N.J.}
}