@incollection{Halliday87-spoken-written,
  author	= {Halliday, M. A. K.},
  editor	= {Horowitz, Rosalind and Samuels, S. Jay},
  year		= {1987},
  title		= {Spoken and written modes of meaning},
  booktitle	= {Comprehending Oral and Written Language},
  publisher	= {Academic Press},
  address	= {New York},
  pages		= {55--82}
}