Não informado. (1932). National Elementary Principal. National Association of Elementary School Principals.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. National Elementary Principal. Arlington, Va: National Association of Elementary School Principals, 1932.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. National Elementary Principal. National Association of Elementary School Principals, 1932.
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