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4HILL C. A classification of educational subject matter [M]. NCES, 1978: 165.
5Classification of instructional programs work group [EB/OL]. [2006 - 04 - 13 ]. http://www.budweb.mnscu.edu/studyGroups/ Technical%20Adveisory%20Committee/CIP%20work%20Group/APR13_2006/NOTES.html.
