@incollection{Hasan78-text,
  author	= {Hasan, Ruqaiya},
  editor	= {Dressler, Wolfgang},
  year		= {1978},
  title		= {Text in the systemic-functional model},
  booktitle	= {Current Trends in Text Linguistics},
  publisher	= {de Gruyter},
  address	= {Berlin}
}