Donker Duyvis, F. (1961). Policy of revision of the Universal Decimal Classification. International Federation For Documentation.
Citazione stile Chigago Style (17a edizione)Donker Duyvis, Frits. Policy of Revision of the Universal Decimal Classification. The Hague: International Federation For Documentation, 1961.
Citatione MLA (9a ed.)Donker Duyvis, Frits. Policy of Revision of the Universal Decimal Classification. International Federation For Documentation, 1961.
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