(2000). Report on In-Class Variables: Fall 1987 & Fall 1992. U.S. Department of Education.
Chicago Style (17. basım) AtıfReport on In-Class Variables: Fall 1987 & Fall 1992. U.S. Department of Education, 2000.
MLA (9th ed.) AtıfReport on In-Class Variables: Fall 1987 & Fall 1992. U.S. Department of Education, 2000.
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