APA (7th ed.) Citation

Van Ek, J. (1988). Threshold level English in a European unit/credit system for modern language learning by adults. Prentice-Hall.

Chicago Style (17th ed.) Citation

Van Ek, J. Threshold Level English in a European Unit/credit System for Modern Language Learning by Adults. New York: Prentice-Hall, 1988.

MLA (9th ed.) Citation

Van Ek, J. Threshold Level English in a European Unit/credit System for Modern Language Learning by Adults. Prentice-Hall, 1988.