Grote winkler prins encyclopedie in 25 delen
door R. C. van Caenegem [and others]
Elsevier, 1980
 Buku Referensi
Algemene winkler prins encyclopedie
door H. R. Hoetink [and others]
Elsevier, 1956
 Buku Referensi
The Encyclopedia Americana : volume 25
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 25
Americana Corporation, 1964
 Buku Referensi
Encyclopaedia universalis : volume 25
Encyclopaedia Universalis France S.A. , 1989
 Buku Referensi
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