The encyclopedia American
Americana Corporation, 1980
Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
Buku Referensi
The encyclopedia Americana
Americana corporation, 1938
Buku Referensi
The encyclopedia American
Americana Corporation, 1980
Buku Referensi
Merriam-Webster's collegiate encyclopedia
Merriam-Webster, 2000
Buku Referensi
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