@incollection{Butler88-politeness,
  author	= {Butler, Christopher S.},
  editor	= {Benson, James D. and Cummings, Michael J. and Greaves, William S.},
  year		= {1988},
  title		= {Politeness and the semantics of modalised directives in English},
  booktitle	= {Linguistics in a Systemic Perspective},
  publisher	= {Benjamins},
  address	= {Amsterdam}
}