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
The Encyclopedia Americana : volume 25
Grolier, 1994
Buku Referensi