Cita APA

Van Ek, J., Alexander, L., & Consejo de Europa. (1977). The threshold level for modern language learning in schools. London: Longman.

Citación estilo Chicago

Van Ek, J.A, L.G Alexander, and Consejo de Europa. The Threshold Level for Modern Language Learning in Schools. London: Longman, 1977.

Cita MLA

Van Ek, J.A, L.G Alexander, and Consejo de Europa. The Threshold Level for Modern Language Learning in Schools. London: Longman, 1977.