Britannica book of the year 1988
Encyclopaedia Britannica Inc., 1988
Buku Referensi
Britannica book of the year 1990
Encyclopaedia Britannica Inc., 1990
Buku Referensi
Britannica book of the year 2002
Encyclopaedia Britannica Inc., 2002
Buku Referensi
Ensiklopedi nasional Indonesia : jilid 8
Cipta Adi Pustaka, 1994
Buku Referensi
The New Encyclopaedia Britannica : volume 8
Encyclopaedia Britannica Inc., 2003
Buku Referensi
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