@incollection{UreEllis77,
  author	= {Ure, Jean N. and Ellis, Jeffrey},
  editor	= {Uribe-Villegas, Oscar},
  year		= {1977},
  title		= {Register in descriptive linguistics and linguistic sociology},
  booktitle	= {Issues in Sociolinguistics},
  publisher	= {Mouton},
  address	= {The Hague}
}