Cita APA

Ek, J. A. v., & Ek, J. A. v. (1980). Threshold level English: In a European unit / credit system for modern language learning by adult. Oxford: Pergamon.

Citación estilo Chicago

Ek, Jan Ate van, y Jan Ate van Ek. Threshold Level English: In a European Unit / Credit System for Modern Language Learning By Adult. Oxford: Pergamon, 1980.

Cita MLA

Ek, Jan Ate van, y Jan Ate van Ek. Threshold Level English: In a European Unit / Credit System for Modern Language Learning By Adult. Oxford: Pergamon, 1980.

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