Encyclopaedia Britannica : volume 4
Encyclopaedia Britannica Inc., 1968
 Buku Referensi
Collier's encyclopedia : volume 4
Macmillan Educational Company, 1990
 Buku Referensi
The Australian encyclopaedia : volume 4
Grolier Society of Australia, 1983
 Buku Referensi
Encyclopaedia universalis : volume 4
Encyclopaedia Universalis France S.A. , 1989
 Buku Referensi
Encyclopedia of knowledge : volume 4
Grolier Incorporated, 1991
 Buku Referensi
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