Karl, C. A. (1990). Teacher observation in selected secondary schools of the Archdiocese of Chicago.
Čikaški stil citiranja (17. izdanje)Karl, Catherine A. Teacher Observation in Selected Secondary Schools of the Archdiocese of Chicago. 1990.
MLA način citiranja (8. izdanje)Karl, Catherine A. Teacher Observation in Selected Secondary Schools of the Archdiocese of Chicago. 1990.
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