APA (7th ed.) Citation

Donker Duyvis, F. (1961). Policy of revision of the Universal Decimal Classification. International Federation For Documentation.

Chicago Style (17th ed.) Citation

Donker Duyvis, Frits. Policy of Revision of the Universal Decimal Classification. The Hague: International Federation For Documentation, 1961.

MLA (9th ed.) Citation

Donker Duyvis, Frits. Policy of Revision of the Universal Decimal Classification. International Federation For Documentation, 1961.