@incollection{Berry87,
  author	= {Berry, Margaret},
  editor	= {Halliday, M. A. K. and Fawcett, Robin P.},
  year		= {1987},
  title		= {Is teacher an unanalysed concept?},
  booktitle	= {New development in systemic linguistics},
  publisher	= {Frances Pinter},
  address	= {London}
}