International Federation for Documetation, Classification Research. (2021). International Classification. Verlag Dokumentation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रInternational Federation for Documetation, Classification Research. International Classification. Munchen, Alemanha: Verlag Dokumentation, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रInternational Federation for Documetation, Classification Research. International Classification. Verlag Dokumentation, 2021.
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