Não informado. (1969). Library & Information Science Abstracts. Library Association Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Library & Information Science Abstracts. London: Library Association Publishing, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Library & Information Science Abstracts. Library Association Publishing, 1969.
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