@incollection{Hasan73,
  author	= {Hasan, Ruqaiya},
  editor	= {Bernstein, Basil},
  year		= {1973},
  title		= {Code, register and social dialect},
  booktitle	= {Class, Codes and Control: applied studies towards a sociology of language},
  publisher	= {Routledge and Kegan Paul},
  pages		= {253--292},
  address	= {London}
}