@incollection{Halliday77,
  author	= {Halliday, Michael A. K.},
  editor	= {van Dijk, Teun and Pet{\"o}fi, Janos},
  year		= {1977},
  title		= {Text as semantic choice in social contexts},
  booktitle	= {Grammars and Descriptions},
  note		= {Abridged version in M.A.K. Halliday (1978) \em Language as social semiotic},
  publisher	= {Walter de Gruyter},
  address	= {Berlin}
}