Report on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
芝加哥风格引文Report on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
MLA引文Report on In-Class Variables: Fall 1987 & Fall 1992. US Department of Education.
警告：这些引文格式不一定是100％准确.