Virtue's new treasury of knowledge : volume 5
Virtue, 1974
Buku Referensi
The World book encyclopedia
World Book, 1992
Buku Referensi
The Encyclopedia Americana : volume 2
Americana Corporation, 1977
Buku Referensi
The Encyclopedia Americana : volume 2
Americana Corporation, 1964
Buku Referensi
Encyclopaedia Britannica : volume 2
Encyclopaedia Britannica Inc., 1967
Buku Referensi
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