@incollection{Martin93-contexutal,
  author	= {Martin, James R.},
  editor	= {Cope, W. and Kalantzis, M.},
  title		= {A contextual theory of language},
  pages		= {116--136},
  booktitle	= {The Powers of Literacy: a genre approach to teaching literacy},
  address	= {London},
  publisher	= {Falmer},
  series	= {(Critical Perspectives on Literacy and Education)},
  note		= {Also published by University of Pittsburg Press (Pittsburg Series in Composition, Literacy, and Culture), Pittsburg},
  year		= {1993}
}