Systems development in adult language learning : a European unit/credit system for modern language learning by adults - Trim, J. L. M. (John Leslie Melville), 1924-; Ek, J. A. van (Jan Ate van), 1925-. (Oxford : Pergamon for and on behalf of the Council of Europe, 1980)
First published in 1973.
Keywords: English language -- Study and teaching -- Foreign students; English language -- Study and teaching -- Europe