Ensiklopedi Indonesia : 6
Ichtiar Baru-Van Hoeve, 1984
 Buku Referensi
Merriam-Webster's collegiate encyclopedia
Merriam-Webster, 2000
 Buku Referensi
Larousse illustrated international encyclopedia
Larousse , 1972
 Buku Referensi
The Encyclopedia Americana : volume 2
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 1
Americana Corporation, 1977
 Buku Referensi
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