Karl, C. A. (1990). Teacher observation in selected secondary schools of the Archdiocese of Chicago.
Chicago Style (17. basım) AtıfKarl, Catherine A. Teacher Observation in Selected Secondary Schools of the Archdiocese of Chicago. 1990.
MLA (8th ed.) AtıfKarl, Catherine A. Teacher Observation in Selected Secondary Schools of the Archdiocese of Chicago. 1990.
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