Cita APA (7a ed.)

Alexander, L. G. (1980). Practice and progress: : New concept english ; An Integrated Course for Pre-Intermediate Students. Longman.

Cita Chicago Style (17a ed.)

Alexander, L. G. Practice and Progress: : New Concept English ; An Integrated Course for Pre-Intermediate Students. Hong Kong: Longman, 1980.

Cita MLA (9a ed.)

Alexander, L. G. Practice and Progress: : New Concept English ; An Integrated Course for Pre-Intermediate Students. Longman, 1980.