The Encyclopedia Americana : volume 12
Grolier, 1994
 Buku Referensi
Ensiklopedi nasional Indonesia : jilid 12
Cipta Adi Pustaka, 1994
 Buku Referensi
Grolier family encyclopedia : volume 12
Grolier Incorporated, 1995
 Buku Referensi
Britannica book of the year 1985
Encyclopaedia Britannica Inc., 1985
 Buku Referensi
Britannica book of the year 1987
Encyclopaedia Britannica Inc., 1987
 Buku Referensi
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