The Encyclopedia Americana : volume 6
Grolier, 1994
 Buku Referensi
The New Encyclopedia Britannica : volume 6
Encyclopedia Britannica, 1983
 Buku Referensi
Grolier family encyclopedia : volume 6
Grolier Incorporated, 1995
 Buku Referensi
The World book encyclopedia : volume 6
World Book, 1985
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 6
Americana Corporation, 1960
 Buku Referensi
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