(1972). Projections of educational statistics to 1981-82 (1972 ed.). U.S. Department of Health, Education and Welfare.
芝加哥风格引文Projections of Educational Statistics to 1981-82. 1972 ed. Washington, D.C: U.S. Department of Health, Education and Welfare, 1972.
MLA引文Projections of Educational Statistics to 1981-82. 1972 ed. U.S. Department of Health, Education and Welfare, 1972.
警告:这些引文格式不一定是100%准确.