(2000). Average Math & Science Performance Scores of 8th- Grade Students. U.S. Department of Education.
芝加哥风格引文Average Math & Science Performance Scores of 8th- Grade Students. U.S. Department of Education, 2000.
MLA引文Average Math & Science Performance Scores of 8th- Grade Students. U.S. Department of Education, 2000.
警告：这些引文格式不一定是100％准确.