Cita APA

Van Ek, J., Alexander, L., & Consejo de Europa. (1988). Threshold level english in a european unit/credit system for modern language learning by adults. London: Longman.

Citación estilo Chicago

Van Ek, J.A, L.G Alexander, and Consejo de Europa. Threshold Level English in a European Unit/credit System for Modern Language Learning By Adults. London: Longman, 1988.

Cita MLA

Van Ek, J.A, L.G Alexander, and Consejo de Europa. Threshold Level English in a European Unit/credit System for Modern Language Learning By Adults. London: Longman, 1988.