The New Encyclopaedia Britannica : volume 18
Encyclopaedia Britannica Inc., 1988
Buku Referensi
The World book encyclopedia : volume 18, U-V
Field Enterprises Educational Corporation, 1963
Buku Referensi
The New book of knowledge : volume 8
Grolier Incorporated, 1997
Buku Referensi
The New book of knowledge : volume 9
Grolier Incorporated, 1997
Buku Referensi
The New book of knowledge : volume 10
Grolier Incorporated, 1997
Buku Referensi
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