@book{Halliday-etal90,
  editor	= {Halliday, M. A. K. and Gibbons, John and Nicholas, Howard},
  year		= {1990},
  title		= {Learning, keeping and using language: selected papers from the 8th World Congress of Applied Linguistics, Sydney, 16-21 August 1987},
  address	= {Amsterdam and Philadelphia},
  publisher	= {Benjamins}
}