@InProceedings{Preston:1998,
author
=
"P.Preston",
title
=
"What kind of validity can we afford?",
booktitle
=
"Innovations and Outcomes in English Language Teacher Education; ISBN: 086355394X",
address
=
"Popowo, Polska",
publisher
=
"Warszawa The British Council ",
pages
=
"241--251",
editor
=
"Patrick James Melia",
year
=
"1998",
}