Não informado. (1926). Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the National Association of Secondary School Principals. Washington: National Association of Secondary School Principals, 1926.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals, 1926.
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