(2000). Ratio of median Annual Earnings for Salary Workers Ages 25-34. U.S. Department of Education.
芝加哥风格引文Ratio of Median Annual Earnings for Salary Workers Ages 25-34. U.S. Department of Education, 2000.
MLA引文Ratio of Median Annual Earnings for Salary Workers Ages 25-34. U.S. Department of Education, 2000.
警告：这些引文格式不一定是100％准确.