Cita APA (7a ed.)

Alexander, L. (1973). New concept english: Developing skills : supplementary written exercises. Longman.

Cita Chicago Style (17a ed.)

Alexander, L.G. New Concept English: Developing Skills : Supplementary Written Exercises. London: Longman, 1973.

Cita MLA (9a ed.)

Alexander, L.G. New Concept English: Developing Skills : Supplementary Written Exercises. Longman, 1973.