Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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