International Federation for Documetation, Classification Research. (2021). International Classification. Verlag Dokumentation.
Chicago Style (17. basım) AtıfInternational Federation for Documetation, Classification Research. International Classification. Munchen, Alemanha: Verlag Dokumentation, 2021.
MLA (8th ed.) AtıfInternational Federation for Documetation, Classification Research. International Classification. Verlag Dokumentation, 2021.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..