@book
{TN_libero_mab2,
author = {
Ek, Jan Ate van
},
title = {
Systems development in adult language learning
the threshod level in a European unit/credit system for modern language learning by adults
},
publisher = {Council of Europe},
keywords = {
Europa
,
Sprachunterricht
,
Erwachsenenbildung
},
year = {1975 [erschienen] 1976},
address = {
Strasbourg
},
}