Cita APA (7a ed.)

Alexander, L. (1973). New concept english: Practice and progress : teacher's book. Longman.

Cita Chicago Style (17a ed.)

Alexander, L.G. New Concept English: Practice and Progress : Teacher's Book. London: Longman, 1973.

Cita MLA (9a ed.)

Alexander, L.G. New Concept English: Practice and Progress : Teacher's Book. Longman, 1973.