@incollection{Oldenburg90,
  author	= {J., Oldenburg (Torr),},
  editor	= {Halliday, Michael A. K. and Gibbons, J. and Nicholas, H.},
  year		= {1990},
  title		= {Learning the language and learning through language in early childhood},
  booktitle	= {Learning, keeping and using language. Volume 1: Selected papers from the 8th world congress of applied linguistics},
  publisher	= {John Benjamins},
  address	= {Amsterdam},
  pages		= {27--38}
}