Britannica book of the year 1988
Encyclopaedia Britannica Inc., 1988
Buku Referensi
Britannica book of the year 1990
Encyclopaedia Britannica Inc., 1990
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Britannica book of the year 2002
Encyclopaedia Britannica Inc., 2002
Buku Referensi
The World book encyclopedia
World Book, 1992
Buku Referensi
The Encyclopedia Americana : the international reference work, volume 12
Americana Corporation, 1960
Buku Referensi
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