Young, D. H. (1973). Pupil-directed versus teacher directed classrooms: Changes in work-study skills at three achievement levels. s.n.].
Παραπομπή σε μορφή Chicago (17η εκδ.)Young, Donna H. Pupil-directed Versus Teacher Directed Classrooms: Changes in Work-study Skills at Three Achievement Levels. [Quezon City: s.n.], 1973.
Παραπομπή σε μορφή MLA (9th εκδ.)Young, Donna H. Pupil-directed Versus Teacher Directed Classrooms: Changes in Work-study Skills at Three Achievement Levels. s.n.], 1973.
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