@incollection{MartinWilliams-toappear,
  author	= {Martin, James R. and Williams, G.},
  editor	= {Ammon, U. and Dittmar, N. and Mattheier, K. and Trudgill, P.},
  title		= {Functional sociolinguistics},
  booktitle	= {Sociolinguistics: an international handbook of the science of language and society},
  address	= {Berlin},
  publisher	= {Walter de Gruyter},
  year		= {to appear}
}