National Association of Secondary School Principals (U.S.). (1981). Schools in the middle.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Association of Secondary School Principals (U.S.). Schools in the Middle. Reston, Va., 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNational Association of Secondary School Principals (U.S.). Schools in the Middle. 1981.
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