Amsterdam [etc.]: Elsevier Grote Winkler Prins: Encyclopedie in twintig delen. 7th ed. (7de geheel nieuwe druk.) Chief editors: J. F. Staal, A. J. Wiggers. 20 vol., 1966–1975. Supplement, 1976. Amsterdam [etc.]: Elsevier. Grote Winkler Prins: Encyclopedie in 25 delen. 8th ed. (8ste geheel nieuwe druk.) Chief editors: R. C. van Caenegem en S. Groenman. 25 vol., 1979–1984. Supplement, 1984. Amsterdam [etc.]: Elsevier. Grote Winkler Prins: Encyclopedie in 26 delen. 9th ed. (9de geheel nieuwe druk.) Chief editor: L. C. M. Röst. 26 vol., 1990–1993. Amsterdam [etc.]: Elsevier. References Bibliography External links Uitgeverij Het Spectrum Geïllustreerde Encyclopædie, 1870-1882, first edition Archive.org: 30 volumes of the 2nd and 3rd editions (1884-1912) Dutch encyclopedias 1870 books 19th-century encyclopedias 20th-century encyclopedias