(2000). Report on In-Class Variables: Fall 1987 & Fall 1992. U.S. Department of Education.
Cita Chicago (17th ed.)Report on In-Class Variables: Fall 1987 & Fall 1992. U.S. Department of Education, 2000.
Cita MLA (9th ed.)Report on In-Class Variables: Fall 1987 & Fall 1992. U.S. Department of Education, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.