Karl, C. A. (1990). Teacher observation in selected secondary schools of the Archdiocese of Chicago.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKarl, Catherine A. Teacher Observation in Selected Secondary Schools of the Archdiocese of Chicago. 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKarl, Catherine A. Teacher Observation in Selected Secondary Schools of the Archdiocese of Chicago. 1990.
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