The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
Ensiklopedi nasional Indonesia : jilid 17
Cipta Adi Pustaka, 1994
 Buku Referensi
The New Encyclopaedia Britannica : volume 17
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
The New Encyclopaedia Britannica : volume 17
Encyclopaedia Britannica Inc., 1978
 Buku Referensi
The New book of knowledge : volume 17
Grolier Incorporated, 1997
 Buku Referensi
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