The encyclopedia American
Americana Corporation, 1980
Buku Referensi
Merriam-Webster's collegiate encyclopedia
Merriam-Webster, 2000
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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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