The encyclopedia American
Americana Corporation, 1980
Buku Referensi
Encyclopaedia Britannica : volume 8
Encyclopaedia Britannica Inc., 1967
Buku Referensi
Encyclopaedia Britannica : volume 8
Encyclopaedia Britannica Inc., 1968
Buku Referensi
Encyclopaedia universalis : volume 8
Encyclopaedia Universalis France S.A. , 1989
Buku Referensi
Merriam-Webster's collegiate encyclopedia
Merriam-Webster, 2000
Buku Referensi
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