Παραπομπή APA

Alexander, L. G. (1977). Practice and progress: An integrated course for pre-intermediate students. London: Longman.

Παραπομπή Chicago Style

Alexander, L. G. Practice and Progress: An Integrated Course for Pre-intermediate Students. London: Longman, 1977.

Παραπομπή MLA

Alexander, L. G. Practice and Progress: An Integrated Course for Pre-intermediate Students. London: Longman, 1977.

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