@incollection{Halliday81-struct,
  author	= {Halliday, Michael A. K.},
  editor	= {Halliday, Michael A. K. and Martin, James R.},
  year		= {1981},
  title		= {Types of structure},
  booktitle	= {Readings in Systemic Linguistics},
  pages		= {29--41},
  note		= {Reprinted version of original paper from 1965},
  publisher	= {Batsford},
  address	= {London}
}