APA (7th ed.) Citation

Ek, J. A. v. (1977). The threshold level for modern language learning in schools. Longman.

Chicago Style (17th ed.) Citation

Ek, Jan Ate van. The Threshold Level for Modern Language Learning in Schools. London: Longman, 1977.

MLA (9th ed.) Citation

Ek, Jan Ate van. The Threshold Level for Modern Language Learning in Schools. Longman, 1977.