Não informado. (1980). Principal. National Association of Elementary School Principals.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Principal. Arlington, Va: National Association of Elementary School Principals, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Principal. National Association of Elementary School Principals, 1980.
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