Não informado. (2021). Information Services & Use. North-Holland Publishing Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Information Services & Use. Amsterdam: North-Holland Publishing Company, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Information Services & Use. North-Holland Publishing Company, 2021.
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