The New Encyclopaedia Britannica : propaedia
Encyclopaedia Britannica Inc., 2003
Buku Referensi
The New Encyclopaedia Britannica : propedia
Encyclopaedia Britannica Inc., 1978
Buku Referensi
The New Encyclopedia Britannica : propedia
Encyclopedia Britannica, 1983
Buku Referensi
The New Encyclopaedia Britannica : propaedia
Encyclopaedia Britannica Inc., 1988
Buku Referensi
The Encyclopedia Americana : volume 1
Americana Corporation, 1977
Buku Referensi
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