@incollection{Richardson81,
  author	= {Richardson, K.},
  editor	= {Coulthard, Malcolm and Montgomery, Michael},
  title		= {Sentences in discourse},
  year		= {1981},
  booktitle	= {Studies in Discourse Analysis},
  publisher	= {Routledge and Kegan Paul},
  address	= {London},
  pages		= {51--60}
}