Pennington, R. C. (1939). Speech in the teaching profession: A study of the professional requirements and the quality of the speech of three groups of teachers.
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Citazione stile Chigago Style (17a edizione)
Pennington, R. Corbin. Speech in the Teaching Profession: A Study of the Professional Requirements and the Quality of the Speech of Three Groups of Teachers. New York, 1939.
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Citatione MLA (9a ed.)
Pennington, R. Corbin. Speech in the Teaching Profession: A Study of the Professional Requirements and the Quality of the Speech of Three Groups of Teachers. 1939.
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Attenzione: Queste citazioni potrebbero non essere precise al 100%.