Ek, J. A. v. (1972). Proposal for a definition of a threshold level in foreign language learning by adults. Council of Europe.
Chicago-Zitierstil (17. Ausg.)Ek, Jan Ate van. Proposal for a Definition of a Threshold Level in Foreign Language Learning by Adults. Strasbourg: Council of Europe, 1972.
MLA-Zitierstil (9. Ausg.)Ek, Jan Ate van. Proposal for a Definition of a Threshold Level in Foreign Language Learning by Adults. Council of Europe, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.