The Encyclopedia Americana : volume 11
Grolier, 1994
 Buku Referensi
The Encyclopedia Americana : volume 11
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 11
Americana Corporation, 1964
 Buku Referensi
Collier's encyclopedia : volume 11
Macmillan Educational Company, 1990
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Grolier family encyclopedia : volume 11
Grolier Incorporated, 1995
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