Não informado. (1951). School Libraries. American Association of School Librarians.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. School Libraries. Fulton, Mo: American Association of School Librarians, 1951.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. School Libraries. American Association of School Librarians, 1951.
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