Cita APA (7a ed.)

Alexander, L. (1971). New concept english: Practice and progress : suplementary written exercises. Longman.

Cita Chicago Style (17a ed.)

Alexander, L.G. New Concept English: Practice and Progress : Suplementary Written Exercises. London: Longman, 1971.

Cita MLA (9a ed.)

Alexander, L.G. New Concept English: Practice and Progress : Suplementary Written Exercises. Longman, 1971.