United States. Department of Education. (1986). What works: Research about teaching and learning. U.S. Dept. of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Department of Education. What Works: Research About Teaching and Learning. Washington, D.C.: U.S. Dept. of Education, 1986.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Department of Education. What Works: Research About Teaching and Learning. U.S. Dept. of Education, 1986.
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