Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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