@incollection{CoulthardBrazil81,
  author	= {Coulthard, Malcolm and Brazil, David C.},
  editor	= {Coulthard, Malcolm and Montgomery, M.},
  year		= {1981},
  title		= {Exchange structure},
  booktitle	= {Studies in discourse analysis},
  publisher	= {Routledge and Kegan Paul},
  address	= {London},
  pages		= {82--106}
}