@incollection{Threadgold88-change,
  author	= {Threadgold, Terry},
  editor	= {Steele, R. and Threadgold, T.},
  year		= {1988},
  title		= {Changing the subject},
  booktitle	= {Language Topics: essays in honour of Michael Halliday},
  publisher	= {Benjamins},
  address	= {Amsterdam},
  pages		= {549--597}
}