Duyvis, F. D., & Duyvis, F. D. (1961). Document reproduction services: Their efficient organization and management. UNESCO.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuyvis, F. Donker, और F Donker;Schippers Duyvis. Document Reproduction Services: Their Efficient Organization and Management. UNESCO, 1961.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDuyvis, F. Donker, और F Donker;Schippers Duyvis. Document Reproduction Services: Their Efficient Organization and Management. UNESCO, 1961.
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