Cita APA (7a ed.)

Alexander, L. G. (1971). Practice and progress: An integrated course for pre-intermediate students. Longman.

Cita Chicago Style (17a ed.)

Alexander, L. G. Practice and Progress: An Integrated Course for Pre-intermediate Students. London: Longman, 1971.

Cita MLA (9a ed.)

Alexander, L. G. Practice and Progress: An Integrated Course for Pre-intermediate Students. Longman, 1971.