(1999). All About Direct Loans. U.S. Department of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAll About Direct Loans. U.S. Department of Education, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAll About Direct Loans. U.S. Department of Education, 1999.
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